+
Abel
EL, Kruger
ML: Maternal and paternal age and twinning in the United States, 2004–2008. J Perinat Med 40:237, 2012
+
Alamia
V Jr, Royek
AB, Jaekle
RK,
et al: Preliminary experience with a prospective protocol for planned vaginal delivery of triplet gestations. Am J Obstet Gynecol 179:1133, 1998
+
Alexander
JM, Leveno
KJ, Rouse
D,
et al: Cesarean delivery for the second twin. Obstet Gynecol 112(4):748, 2008
+
Allen
VM, Windrim
R, Barrett
J,
et al: Management of monoamniotic twin pregnancies: a case series and systematic review of the literature. BJOG 108:931, 2001
+
Alran
S, Sibony
O, Luton
D,
et al: Maternal and neonatal outcome of 93 consecutive triplet pregnancies with 71% vaginal delivery. Acta Obstet Gynecol Scand 83:554, 2004
+
American College of Obstetricians and Gynecologists: Multiple gestation: complicated twin, triplet, and high-order multifetal pregnancy. Practice Bulletin No. 56, October 2004, Reaffirmed 2010
+
American College of Obstetricians and Gynecologists: Ultrasonography in pregnancy. Practice Bulletin No. 101, February 2009, Reaffirmed 2011
+
American College of Obstetricians and Gynecologists: Multifetal pregnancy reduction. Committee Opinion No. 553, February 2013a
+
American College of Obstetricians and Gynecologists: Vaginal birth after previous cesarean delivery. Practice Bulletin No. 115, August 2010, Reaffirmed 2013b
+
American Society for Reproductive Medicine and Society for Assisted Reproductive Technology: Criteria for number of embryos to transfer: a committee opinion. Fertil Steril 99(1):44, 2013
+
Ananth
CV, Chauhan
SP: Epidemiology of twinning in developed countries. Semin Perinatol 36:156, 2012
+
Andrews
WW, Leveno
KJ, Sherman
ML,
et al: Elective hospitalization in the management of twin pregnancies. Obstet Gynecol 77:826, 1991
+
Antsaklis
A, Fotodotis
M, Sindos,
M,
et al: Trends in twin pregnancies and mode of delivery during the last 30 years: inconsistency between guidelines and clinical practice. J Perinat Med 41(4):355, 2013
+
Arabin
B, Halbesma
JR, Vork
F,
et al: Is treatment with vaginal pessaries an option in patients with a sonographically detected short cervix? J Perinat Med 31:122, 2003
+
Arabin
B, van Eyck
J: Delayed-interval delivery in twin and triplet pregnancies: 17 years of experience in 1 perinatal center. Am J Obstet Gynecol 200(2):154.e1, 2009
+
Armson
BA, O’Connell
C, Persad
V,
et al: Determinants of perinatal mortality and serious neonatal morbidity in the second twin. Obstet Gynecol 108 (3 Pt 1):556, 2006
+
Aston
K, Peterson
C, Carrell
D: Monozygotic twinning associated with assisted reproductive technologies: a review. Reproduction 136(4):377, 2008
+
Bagchi
S, Salihu
HM: Birth weight discordance in multiple gestations: occurrence and outcomes. J Obstet Gynaecol 26(4):291, 2006
+
Barrett
JFR, Hannah
ME, Hutton
EK,
et al: A randomized trial of planned cesarean or vaginal delivery for twin pregnancy. N Engl J Med 369:1295, 2013
+
Baschat
AA, Barber
J, Pedersen
N,
et al: Outcome after fetoscopic selective laser ablation of placental anastomoses vs equatorial laser dichorionization for the treatment of twin-to-twin transfusion syndrome. Am J Obstet Gynecol 209:1.e1, 2013
+
Battista
L, Winovitch
KC, Rumney
PJ,
et al: A case-control comparison of the effectiveness of betamethasone to prevent neonatal morbidity and mortality in preterm twin and singleton pregnancies. Am J Perinat 25(7):449, 2008
+
Bdolah
Y, Lam
C, Rajakumar
A,
et al: Twin pregnancy and the risk of preeclampsia: bigger placenta or relative ischemia? Am J Obstet Gynecol 198: 438.e1, 2008
+
Beemsterboer
SN, Homburg
R, Gorter
NA,
et al: The paradox of declining fertility but increasing twinning rates with advancing maternal age. Hum Reprod 21:1531, 2006
+
Bejar
R, Vigliocco
G, Gramajo
H,
et al: Antenatal origin of neurological damage in newborn infants. 2. Multiple gestations. Am J Obstet Gynecol 162:1230, 1990
+
Bekiesinka-Figatowska
M, Herman-Sucharska
I, Romaniuk-Doroszewska
A,
et al: Diagnostic problems in case of twin pregnancies: US vs MRI study. J Perinat Med 41(5):535, 2013
+
Benirschke
K, Kim
CK: Multiple pregnancy. N Engl J Med 288:1276, 1973
+
Bennett
D, Dunn
LC: Genetical and embryological comparisons of semilethal t-alleles from wild mouse populations. Genetics 61:411, 1969
+
Berghella
V, Odibo
AO, To
MS,
et al: Cerclage for short cervix on ultrasonography: meta-analysis of trials using individual patient-level data. Obstet Gynecol 106(1):181, 2005
+
Blickstein
I, Goldman
RD, Kupferminc
M: Delivery of breech first twins: a multicenter retrospective study. Obstet Gynecol 95:37, 2000
+
Blickstein
I, Perlman
S: Single fetal death in twin gestations. J Perinat Med 41:65, 2013
+
Boyle
B, McConkey
R, Garne
E,
et al: Trends in the prevalence, risk and pregnancy outcome of multiple births with congenital anomaly: a registry-based study in 14 European countries 1984–2007. BJOG 120:707, 2013
+
Brady
PC, Correia
KF, Missmer
SA,
et al: Early β-human chorionic gonadotropin trends in vanishing twin pregnancies. Fertil Steril 100(1):116, 2013
+
Bulmer
MG: The effect of parental age, parity, and duration of marriage on the twinning rate. Hum Genet 23:454, 1959
+
Cahill
A, Stamilio
DM, Paré
E,
et al: Vaginal birth after cesarean (VBAC) attempt in twin pregnancies: is it safe? Am J Obstet Gynecol 193:1050, 2005
+
Campbell
DM: Maternal adaptation in twin pregnancy. Semin Perinatol 10: 14, 1986
+
Caritis
SN, Rouse
DJ, Peaceman
AM,
et al: Prevention of preterm birth in triplets using 17alpha-hydroxyprogesterone caproate: a randomized controlled trial. Obstet Gynecol 113(2 Pt 1):285, 2009
+
Caritis
SN, Simhan
H, Zhao
Y,
et al: Relationship between 17-hydroxyprogestrone caproate concentrations and gestational age at delivery in twin gestation. Am J Obstet Gynecol 207:396.e1, 2012
+
Caukwell
S, Murphy
DJ: The effect of mode of delivery and gestational age on neonatal outcome of the non-cephalic-presenting second twin. Am J Obstet Gynecol 187:1356, 2002
+
Cetingoz
E, Cam
C, Sakalh
M,
et al: Progesterone effects on preterm birth in high-risk pregnancies: a randomized placebo-controlled trial. Arch Gynecol Obstet 283:423, 2011
+
Challis
D, Gratacos
E, Deprest
JA: Cord occlusion techniques for selective termination in monochorionic twins. J Perinat Med 27:327, 1999
+
Chang
E, Park
M, Kim
Y,
et al: A case of successful selective abortion using radio-frequency ablation in twin pregnancy suffering from severe twin to twin transfusion syndrome. J Korean Med Sci 24:513, 2009
+
Chasen
ST, Luo
G, Perni
SC,
et al: Are in vitro fertilization pregnancies with early spontaneous reduction high risk? Am J Obstet Gynecol 195:814, 2006
+
Chauhan
SP, Roberts
WE, McLaren
RA,
et al: Delivery of the nonvertex second twin: breech extraction versus external cephalic version. Am J Obstet Gynecol 173:1015, 1995
+
Chauhan
SP, Scardo
JA, Hayes
E,
et al: Twins: prevalence, problems, and preterm births. Am J Obstet Gynecol 203(4):305, 2010
+
Chervenak
FA, McCullough
LB: Ethical challenges in the management of multiple pregnancies: the professional responsibility model of perinatal ethics. J Perinat Med 41:61, 2013
+
Choi
Y, Bishai
D, Minkovitz
CS: Multiple births are a risk factor for postpartum maternal depressive symptoms. Pediatrics 123(4):1147, 2009
+
Christensen
K, Petersen
I, Skytthe
A,
et al: Comparison of academic performance of twins and singletons in adolescence: follow-up study. BMJ 333:1095, 2006
+
Cohen
M, Kohl
SG, Rosenthal
AH: Fetal interlocking complicating twin gestation. Am J Obstet Gynecol 91:407, 1965
+
Combs
CA, Garite
T, Maurel
K,
et al: 17-Hydroxyprogesterone caproate for twin pregnancy: a double-blind, randomized clinical trial. Am J Obstet Gynecol 204(3):221.e1, 2011
+
Conde-Agudelo
A, Romero
R, Hassan
SS,
et al: Transvaginal sonographic cervical length for the prediction of spontaneous preterm birth in twin pregnancies: a systematic review and metaanalysis. Am J Obstet Gynecol 203:128.e1, 2010
+
Corsello
G, Piro
E: The world of twins: an update. J Matern Fetal Neonatal Med 23(S3):59, 2010
+
Crombleholme
TM, Shera
D, Lee
H,
et al: A prospective, randomized, multicenter trial of amnioreduction vs selective fetoscopic laser photocoagulation for the treatment of severe twin-twin transfusion syndrome. Am J Obstet Gynecol 197:396.e1, 2007
+
Crowther
CA, Han
S: Hospitalization and bed rest for multiple pregnancy. Cochrane Database Syst Rev 7:CD000110, 2010
+
D’Alton
ME: Delivery of the second twin. Obstet Gynecol 115(2):221, 2010
+
Davidson
L, Easterling
TR, Jackson
JC,
et al: Breech extraction of low-birth-weight second twins. Am J Obstet Gynecol 166:497, 1992
+
De Paepe
ME, DeKoninck
P, Friedman
RM: Vascular distribution patterns in monochorionic twin placentas. Placenta 26(6):471, 2005
+
Derbent
A, Simavli
S, Gumus
I,
et al: Nifedipine for the treatment of preterm labor in twin and singleton pregnancies. Arch Gynecol Obstet 284:821, 2011
+
DeVoe
LD: Antenatal fetal assessment: multifetal gestation—an overview. Semin Perinatol 32:281, 2008
+
Diamond
MP, Mitwally
M, Casper
R,
et al: Estimating rates of multiple gestation pregnancies: sample size calculation from the assessment of multiple intrauterine gestations from ovarian stimulation (AMIGOS) trial. Contemp Clin Trials 32:902, 2011
+
Dickey
RP, Taylor
SN, Lu
PY,
et al: Spontaneous reduction of multiple pregnancy: incidence and effect on outcome. Am J Obstet Gynecol 186:77, 2002
+
Dodd
J, Crowther
C: Multifetal pregnancy reduction of triplet and higher-order multiple pregnancies to twins. Fertil Steril 81(5):1420, 2004
+
Dodd
JM, Crowther
CA: Reduction of the number of fetuses for women with a multiple pregnancy. Cochran Database Syst Rev 10:CD003932, 2012
+
Dolapcioglu
K, Gungoren
A, Hakverdi
S,
et al: Twin pregnancy with a complete hydatidiform mole and co-existent live fetus: two case reports and review of the literature. Arch Gynecol Obstet 279:431, 2009
+
Donner
C, Shahabi
S, Thomas
D,
et al: Selective feticide by embolization in twin-twin transfusion syndrome. A report of two cases. J Reprod Med 42: 747, 1997
+
Dor
J, Shalev
J, Mashiach
S,
et al: Elective cervical suture of twin pregnancies diagnosed ultrasonically in the first trimester following induced ovulation. Gynecol Obstet Invest 13:55, 1982
+
Durnwald
CP, Momirova
V, Rouse
DJ,
et al: Second trimester cervical length and risk of preterm birth in women with twin gestations treated with 17-α hydroxyprogesterone caproate. J Matern Fetal Neonatal Med 23(12):1360, 2010
+
Eddib
A, Rodgers
B, Lawler
J,
et al: Monochorionic pseudomonoamniotic twin pregnancy with fetal demise of one twin and development of maternal consumptive coagulopathy. Ultrasound Obstet Gynecol 28:735, 2006
+
Edris
F, Oppenheimer
L, Yang
Q,
et al: Relationship between intertwin delivery interval and metabolic acidosis in the second twin. Am J Perinatol 23(8):481, 2006
+
Ehsanipoor
R, Arora
N, Lagrew
DC,
et al: Twin versus singleton pregnancies complicated by preterm premature rupture of membranes. J Matern Fetal Neonatal Med 25(6):658, 2012
+
Ekelund
CK, Skibsted
L, Sogaard
K,
et al: Dizygotic monochorionic twin pregnancy conceived following intracytoplasmic sperm injection treatment and complicated by twin-twin transfusion syndrome and blood chimerism. Ultrasound Obstet Gynecol 32:282, 2008
+
Elimian
A, Figueroa
R, Nigam
S,
et al: Perinatal outcome of triplet gestation: does prophylactic cerclage make a difference? J Matern Fetal Neonatal Med 8:119, 1999
+
Elliott
JP: Preterm labor in twins and high-order multiples. Clin Perinatol 34:599, 2007
+
Elliott
JP, Finberg
HJ: Biophysical profile testing as an indicator of fetal well-being in high-order multiple gestations. Am J Obstet Gynecol 172:508, 1995
+
Ericson
A, Källén
B, Aberg
A: Use of multivitamins and folic acid in early pregnancy and multiple births in Sweden. Twin Res 4(2):63, 2001
+
Evans
MI, Berkowitz
RL, Wapner
RJ,
et al: Improvement in outcomes of multifetal pregnancy reduction with increased experience. Am J Obstet Gynecol 184:97, 2001
+
Evans
MI, Ciorica
D, Britt
DW,
et al: Update on selective reduction. Prenat Diagn 25:807, 2005
+
Evans
MI, Goldberg
JD, Horenstein
J,
et al: Elective termination for structural, chromosomal, and mendelian anomalies: international experience. Am J Obstet Gynecol 181:893, 1999
+
Evans
MI, Johnson
MP, Quintero
RA,
et al: Ethical issues surrounding multifetal pregnancy reduction and selective termination. Clin Perinatol 23:437, 1996
+
Evans
MI, Kaufman
MI, Urban
AJ,
et al: Fetal reduction from twins to a singleton: a reasonable consideration? Obstet Gynecol 104:1423, 2004
+
Faye-Petersen
OM, Heller
DS, Joshi
VV: Handbook of Placental Pathology, 2nd ed, London, Taylor & Francis, 2006
+
Fellman
J, Eriksson
AW: Secondary sex ratio in multiple births. Twin Res Hum Genet 13(1):101, 2010
+
Ford
AA, Bateman
BT, Simpson
LL: Vaginal birth after cesarean delivery in twin gestations: a large, nationwide sample of deliveries. Am J Obstet Gynecol 195:1138, 2006
+
Fox
H, Sebire
NJ: Pathology of the Placenta, 3rd ed. Philadelphia, Saunders, 2007
+
Fox
NS, Roman
AS, Saltzman
DH,
et al: Risk factors for preeclampsia in twin pregnancies. Am J Perinatol 31(2):163, 2014
+
Fox
NS, Silverstein
M, Bender
S,
et al: Active second-stage management in twin pregnancies undergoing planned vaginal delivery in a U.S. population. Obstet Gynecol 115:229, 2010
+
Francois
K, Ortiz
J, Harris
C,
et al: Is peripartum hysterectomy more common in multiple gestations? Obstet Gynecol 105:1369, 2005
+
Fusi
L, Gordon
H: Twin pregnancy complicated by single intrauterine death. Problems and outcome with conservative management. BJOG 97:511, 1990
+
Fusi
L, McParland
P, Fisk
N,
et al: Acute twin-twin transfusion: a possible mechanism for brain-damaged survivors after intrauterine death of a monochorionic twin. Obstet Gynecol 78:517, 1991
+
Gabriel
R, Harika
G, Saniez
D,
et al: Prolonged intravenous ritodrine therapy: a comparison between multiple and singleton pregnancies. Eur J Obstet Gynecol Reprod Biol 57:65, 1994
+
Gardner
MO, Goldenberg
RL, Cliver
SP,
et al: The origin and outcome of preterm twin pregnancies. Obstet Gynecol 85:553, 1995
+
Ghi
T, Nanni
M, Pierantoni
L,
et al: Neonatal respiratory morbidity in twins versus singletons after elective prelabor caesarean section. Eur J Obstet Gynecol Reprod Biol 166:156, 2013
+
Giles
W, Bisits
A, O’Callaghan
S,
et al: The Doppler assessment in multiple pregnancy randomized controlled trial of ultrasound biometry versus umbilical artery Doppler ultrasound and biometry in twin pregnancy. BJOG 110:593, 2003
+
Giles
WB, Trudinger
BJ, Cook
CM,
et al: Doppler umbilical artery studies in the twin-twin transfusion syndrome. Obstet Gynecol 76(6):1097, 1990
+
Giuffre
M, Piro
E, Corsello
G: Prematurity and twinning. J Matern Fetal Neonatal Med 25(53):6, 2012
+
Gjerris
AC, Loft
A, Pinborg
A,
et al: The effect of a “vanishing twin” on biochemical and ultrasound first trimester screening markers for Down’s syndrome in pregnancies conceived by assisted reproductive technology. Hum Reprod 24(1):55, 2009
+
Glinianaia
SV, Rankin
J, Wright
C: Congenital anomalies in twins: a register-based study. Hum Reprod 23:1306, 2008
+
Goldenberg
RL, Iams
JD, Miodovnik
M,
et al: The preterm prediction study: risk factors in twin gestations. Am J Obstet Gynecol 175:1047, 1996
+
Gonzalez
NL, Goya
M, Bellart
J,
et al: Obstetric and perinatal outcome in women with twin pregnancy and gestational diabetes. J Matern Fetal Neonatal Med 25(7):1084, 2012
+
Goodnight
W, Newman
R: Optimal nutrition for improved twin pregnancy outcome. Obstet Gynecol 114:1121, 2009
+
Gourheux
N, Deruelle
P, Houfflin-Debarge
V,
et al: Twin-to-twin delivery interval: is a time limit justified? Gynecol Obstet Fertil 35(10):982, 2007
+
Greene
MF: Comment on: A randomized trial of planned cesarean or vaginal delivery for twin pregnancy. N Engl J Med 369(14):1365, 2013
+
Grobman
WA, Milad
MP, Stout
J,
et al: Patient perceptions of multiple gestations: an assessment of knowledge and risk aversion. Am J Obstet Gynecol 185:920, 2001
+
Grobman
WA, Peaceman
AM, Haney
EI,
et al: Neonatal outcomes in triplet gestations after a trial of labor. Am J Obstet Gynecol 179:942, 1998
+
Gyamfi
C, Mele
L, Wapner
R,
et al: The effect of plurality and obesity on betamethasone concentrations in women at risk for preterm delivery. Am J Obstet Gynecol 203:219.e1, 2010
+
Gyetvai
K, Hannah
ME, Hodnett
ED,
et al: Tocolytics for preterm labor: a systematic review. Obstet Gynecol 94:869, 1999
+
Hack
KE, Derks
JB, Elias
SG,
et al: Increased perinatal mortality and morbidity in monochorionic versus dichorionic twin pregnancies: clinical implications of a large Dutch cohort study. BJOG 115:58, 2008
+
Hack
KE, Derks
JB, Schaap
AH: Placental characteristics of monoamniotic twin pregnancies in relation to perinatal outcome. Obstet Gynecol 113(2 Pt 1):353, 2009
+
Haggarty
P, McCallum
H, McBain
H,
et al: Effect of B vitamins and genetics on success of in-vitro fertilization: prospective cohort study. Lancet 367(9521):1513, 2006
+
Hall
JG: Twinning. Lancet 362:735, 2003
+
Harris
DW: Superfecundation: letter. J Reprod Med 27:39, 1982
+
Hasbargen
U, Lohse
P, Thaler
CJ: The number of dichorionic twin pregnancies is reduced by the common MTHFR 677C—>T mutation. Hum Reprod 15(12):2659, 2000
+
Hernandez
JS, Twickler
DM, McIntire
DD,
et al: Hydramnios in twin gestations. Obstet Gynecol 120(4):759, 2012
+
Heyborne
KD, Porreco
RP, Garite
TJ,
et al: Improved perinatal survival of monoamniotic twins with intensive inpatient monitoring. Am J Obstet Gynecol 192(1):96, 2005
+
Hibbeln
JF, Shors
SM, Byrd
Se: MRI: is there a role in obstetrics? Clin Obstet Gynecol 55(1):352, 2012
+
Hill
LM, Krohn
M, Lazebnik
N,
et al: The amniotic fluid index in normal twin pregnancies. Am J Obstet Gynecol 182(4):950, 2000
+
Hillman
SC, Morris
RK, Kilby
MD: Co-twin prognosis after single fetal death. A systematic review and meta-analysis. Obstet Gynecol 118(4):928, 2011
+
Hoekstra
C, Zhao
ZZ, Lambalk
CB,
et al: Dizygotic twinning. Hum Reprod Update 14:37, 2008
+
Hoffmann
E, Oldenburg
A, Rode
L,
et al: Twin births: cesarean section or vaginal delivery? Acta Obstet Gynecol Scand 91(4):463, 2012
+
Hogle
KL, Hutton
EK, McBrien
KA,
et al: Cesarean delivery for twins: a systematic review and meta-analysis. Am J Obstet Gynecol 188:220, 2003
+
Hollier
LM, McIntire
DD, Leveno
KJ: Outcome of twin pregnancies according to intrapair birth weight differences. Obstet Gynecol 94:1006, 1999
+
Hu
LS, Caire
J, Twickler
DM: MR findings of complicated multifetal gestations. Pediatr Radiol 36:76, 2006
+
Huber
A, Diehl
W, Zikulnig
L,
et al: Perinatal outcome in monochorionic twin pregnancies complicated by amniotic fluid discordance without severe twin-twin transfusion syndrome. Ultrasound Obstet Gynecol 27:45, 2006
+
Joo
JG, Csaba
A, Szigeti
Z,
et al: Spontaneous abortion in multiple pregnancy: focus on fetal pathology. Pathol Res Pract 208:458, 2012
+
Joseph
KS, Allen
AC, Dodds
L,
et al: Causes and consequences of recent increases in preterm birth among twins. Obstet Gynecol 98:57, 2001
+
Kahn
B, Lumey
LH, Zybert
PA,
et al: Prospective risk of fetal death in singleton, twin, and triplet gestations: implications for practice. Obstet Gynecol 102:685, 2003
+
Kametas
NA, McAuliffe
F, Krampl
E,
et al: Maternal cardiac function in twin pregnancy. Obstet Gynecol 102:806, 2003
+
Kaufman
D, Du
L, Velcek
F,
et al: Fetus-in-fetu. J Am Coll Surg 205(2):378, 2007
+
Kawaguchi
H, Ishii
K, Yamamoto
R,
et al: Perinatal death of triplet pregnancies by chorionicity. Am J Obstet Gynecol 209(1):36.e1, 2013
+
Kent
EM, Breathnach
FM, Gillan
JE,
et al: Placental pathology, birthweight discordance, and growth restriction in twin pregnancy: results of the ESPRIT Study. Am J Obstet 207(3):220.e1, 2012
+
Kilpatrick
SJ, Jackson
R, Croughan-Minihane
MS: Perinatal mortality in twins and singletons matched for gestational age at delivery at > or = 30 weeks. Am J Obstet Gynecol 174:66, 1996
+
Kim
JH, Park
SW, Lee
JJ: Birth weight reference for triples in Korea. J Korean Med Sci 25:900, 2010
+
Klein
K, Mailath-Pokorny
M, Elhenicky
M,
et al: Mean, lowest, and highest pulsatility index of the uterine artery and adverse pregnancy outcome in twin pregnancies. Am J Obstet Gynecol 205:549 –e1, 2011
+
Knox
G, Morley
D: Twinning in Yoruba women. J Obstet Gynaecol Br Emp 67:981, 1960
+
Kogan
MD, Alexander
GR, Kotelchuck
M: Trends in twin birth outcomes and prenatal care utilization in the United States, 1981–1997. JAMA 283:335, 2000
+
Kuleva
M, Youssef
A, Maroni
E,
et al: Maternal cardiac function in normal twin pregnancy: a longitudinal study. Ultrasound Obstet Gynecol 38:575, 2011
+
Kulkarni
AD, Jamieson
DJ, Jones
HW Jr,
et al: Fertility treatments and multiple births in the United States. N Engl J Med 369(23):2218, 2013
+
Langer
B, Boudier
E, Gasser
B,
et al: Antenatal diagnosis of brain damage in the survivor after the second trimester death of a monochorionic monoamniotic co-twin: case report and literature review. Fetal Diagn Ther 12:286, 1997
+
Lanna
MM, Rustico
MA, Dell’Avanzo
M,
et al: Bipolar cord coagulation for selective deicide in complicated monochorionic twin pregnancies: 118 consecutive cases at a single center. Ultrasound Obstet Gynecol 39:407, 2012
+
Lantieri
T, Revelli
A, Gaglioti
P,
et al: Superfetation after ovulation induction and intrauterine insemination performed during an unknown ectopic pregnancy. Reprod Biomed Online 20(5):664, 2010
+
Lee
H, Wagner
AJ, Sy
E,
et al: Efficacy of radiofrequency ablation for twin-reversed arterial perfusion sequence. Am J Obstet Gynecol 196:459.e1, 2007
+
Lee
HC, Gould
JB, Boscardin
WJ,
et al: Trends in cesarean delivery for twin births in the United State 1995–2008. Obstet Gynecol 118(5):1095, 2011
+
Lee
YM, Wylie
BJ, Simpson
LL,
et al: Twin chorionicity and the risk of stillbirth. Obstet Gynecol 111:301, 2008
+
Leftwich
HK, Zaki
MN, Wilkins
I,
et al: Labor patterns in twin gestations. Am J Obstet Gynecol 209(3):254.e1, 2013
+
Legro
RS, Kunselman
AR, Brzyski
RG,
et al: The pregnancy in polycystic ovary syndrome II (PPCOS II) trial: rationale and design of a double-blind randomized trial of clomiphene citrate and letrozole for the treatment of infertility in women with polycystic ovary syndrome. Contemp Clin Trials 33:470, 2012
+
Leung
TY, Tam
WH, Leung
TN,
et al: Effect of twin-to-twin delivery interval on umbilical cord blood gas in the second twins. BJOG 109(1):63, 2002
+
Leveno
KJ, Quirk
JG, Whalley
PJ,
et al: Fetal lung maturation in twin gestation. Am J Obstet Gynecol 148:405, 1984
+
Lewi
L, Deprest
J, Hecher
K: The vascular anastomoses in monochorionic twin pregnancies and their clinical consequences. Am J Obstet Gynecol 208(1):19, 2013
+
Lewi
L, Gratacos
E, Ortibus
E,
et al: Pregnancy and infant outcome of 80 consecutive cord coagulations in complicated monochorionic multiple pregnancies. Am J Obstet Gynecol 194(3):782, 2006
+
Lewi
L, Valencia
C, Gonzalez
E,
et al: The outcome of twin reversed arterial perfusion sequence diagnosed in the first trimester. Am J Obstet Gynecol 293(3):213.e1, 2010
+
Liem
S, Schuit
E, Hegerman
M,
et al: Cervical pessaries for prevention of preterm birth in women with a multiple pregnancy (ProTWIN): a multicenter, open-label randomised controlled trial. Lancet 382(9901):1341, 2013
+
Livingston
JC, Lim
FY, Polzin
W,
et al: Intrafetal radiofrequency ablation for twin reversed arterial perfusion (TRAP): a single-center experience. Am J Obstet Gynecol 197:399.e1, 2007
+
Livingston
JC, Livingston
LW, Ramsey
R,
et al: Second-trimester asynchronous multifetal delivery results in poor perinatal outcome. Obstet Gynecol 103:77, 2004
+
Lopriore
E, Oepkes
D: Neonatal morbidity in twin-twin transfusion syndrome. Early Hum Dev 87:595, 2011
+
Lorenz
JM: Neurodevelopmental outcomes of twins. Semin Perinatol 36(3): 201, 2012
+
Luke
B: The changing pattern of multiple births in the United States: maternal and infant characteristics, 1973 and 1990. Obstet Gynecol 84:101, 1994
+
Luke
B, Brown
MB: Maternal morbidity and infant death in twin vs triplet and quadruplet pregnancies. Am J Obstet Gynecol 198:401.e1, 2008
+
MacDonald-Wallis
C, Lawlor
DA, Fraser
A,
et al: Blood pressure change in normotensive, gestational hypertensive, preeclamptic, and essential hypertensive pregnancies. Hypertension 59:1241, 2012
+
MacGillivray
I: Epidemiology of twin pregnancy. Semin Perinatol 10:4, 1986
+
Magann
EF, Chauhan
SP, Whitworth
NS,
et al: Determination of amniotic fluid volume in twin pregnancies: ultrasonographic evaluation versus operator estimation. Am J Obstet Gynecol 182:1606, 2000
+
Mahone
PR, Sherer
DM, Abramowicz
JS,
et al: Twin-twin transfusion syndrome: rapid development of severe hydrops of the donor following selective feticide of the hydropic recipient. Am J Obstet Gynecol 169:166, 1993
+
Mahony
BS, Mulcahy
C, McCauliffe
F,
et al: Fetal death in twins. Acta Obstet Gynecol Scand 90(11):1274, 2011
+
Manning
FA (ed): Fetal biophysical profile scoring. In Fetal Medicine: Principles and Practices. Norwalk, Appleton & Lange, 1995, p 288
+
Martin
JA, Hamilton
BE, Ventura
SJ,
et al: Births: final data for 2010. Natl Vital Stat Rep 61(1):1, 2012
+
Mathews
TH, MacDorman
MF: Infant mortality statistics from the 2009 period linked birth/infant death data set. Natl Vital Stat Rep 61(8):1, 2013
+
Maynard
SE, Moore Simas
TA, Solitro
MJ,
et al: Circulating angiogenic factors in singleton vs multiple gestation pregnancies. Am J Obstet 198:200.e1, 2008
+
McClamrock
HD, Jones
HW, Adashi
EY: Ovarian stimulation and intrauterine insemination at the quarter centennial: implications for the multiple births epidemic. Fertil Steril 97(4):802, 2012
+
McElrath
TF, Norwitz
ER, Robinson
JN,
et al: Differences in TDx fetal lung maturity assay values between twin and singleton pregnancies. Am J Obstet Gynecol 182:1110, 2000
+
McHugh
K, Kiely
EM, Spitz
L: Imaging of conjoined twins. Pediatr Radiol 36:899, 2006
+
McMahon
KS, Neerhof
MG, Haney
EI,
et al: Prematurity in multiple gestations: identification of patients who are at low risk. Am J Obstet Gynecol 186:1137, 2002
+
McPherson
JA, Odibo
o, Shanks
AL,
et al: Impact of chorionicity on risk and timing of intrauterine fetal demise in twin pregnancies. Am J Obstet Gynecol 207:190.e1, 2012
+
Mhyre
JM: Maternal mortality. Curr Opin Anesthesiol 25:277, 2012
+
Michelfelder
E, Gottliebson
W, Border
W,
et al: Early manifestations and spectrum of recipient twin cardiomyopathy in twin-twin transfusion syndrome: relation to Quintero stage. Ultrasound Obstet Gynecol 30:965, 2007
+
Miller
J, Chauhan
SP, Abuhamad
AZ: Discordant twins: diagnosis, evaluation and management. Am J Obstet Gynecol 206(1):10, 2012
+
Moise
KJ, Dorman
K, Lamvu
G,
et al: A randomized trial of amnioreduction versus septostomy in the treatment of twin-twin transfusion syndrome. Am J Obstet Gynecol 193:701, 2005
+
Morikawa
M, Yamada
T, Yamada
T,
et al: Prospective risk of stillbirth: monochorionic diamniotic twins vs dichorionic twins. J Perinat Med 40:245, 2012
+
Muggli
EE, Halliday
JL: Folic acid and risk of twinning: a systematic review of the recent literature, July 1994 to July 2006. MJA 186(5):243, 2007
+
Muleba
N, Dashe
N, Yost
D,
et al: Respiratory morbidity among second-born twins. Presented at the 25th Annual Meeting of the Society for Maternal Fetal Medicine, Reno, Nevada, February 7–12, 2005
+
Mutchinick
OM, Luna-Munoz
L, Amar
E,
et al: Conjoined twins: a worldwide collaborative epidemiological study of the international clearinghouse for birth defects surveillance and research. Am J Med Genet C Semin Med Genet 15;157C(4):274, 2011
+
Newman
RB, Krombach
S, Myers
MC,
et al: Effect of cerclage on obstetrical outcome in twin gestations with a shortened cervical length. Am J Obstet Gynecol 186:634, 2002
+
Niemann
I, Sunde
L, Petersen
LK: Evaluation of the risk of persistent trophoblastic disease after twin pregnancy with diploid hydatidiform mole and coexisting normal fetus. Am J Obstet Gynecol 197:45.e1, 2007
+
Norman
JE, Mackenzie
F, Owen
P,
et al: Progesterone for the prevention of preterm birth in twin pregnancy (STOPPIT): a randomised, double-blind, placebo-controlled study and meta-analysis. Lancet 373:2034, 2009
+
Nylander
PP: Biosocial aspects of multiple births. J Biosoc Sci 3:29, 1971
+
Nylander
PP: Serum levels of gonadotropins in relation to multiple pregnancy in Nigeria. BJOG 80:651, 1973
+
Odibo
AO, Cahill
AG, Goetzinger
KR,
et al: Customized growth charts for twin gestations to optimize identification of small-for-gestational age fetuses at risk of intrauterine fetal death. Ultrasound Obstet Gynecol 41:637, 2013
+
O’Donoghue
KO, Barlgye
O, Pasquini
L: Interstitial laser therapy for fetal reduction in monochorionic multiple pregnancy: loss rate and association with aplasia cutis congenita. Prenat Diagn 28:535, 2008
+
Olusanya
BO, Solanke
OA: Perinatal correlates of delayed childbearing in a developing country. Arch Gynecol Obstet 285(4):951, 2012
+
Ong
SS, Zamora
J, Khan
KS,
et al: Prognosis for the co-twin following single-twin death: a systematic review. BJOG 113:992, 2006
+
Painter
JN, Willemsen
G, Nyholt
D,
et al: A genome wide linkage scan for dizygotic twinning in 525 families of mothers of dizygotic twins. Human Reprod 25(6):1569, 2010
+
Pakrashi
T, Defranco
EA: The relative proportion of preterm births complicated by premature rupture of membranes in multifetal gestations: a population-based study. Am J Perinatol 30:69, 2013
+
Peaceman
AM, Kuo
L, Feinglass
J: Infant morbidity and mortality associated with vaginal delivery in twin gestations. Am J Obstet Gynecol 200(4):462.e1, 2009
+
Pettit
KE, Merchant
M, Machin
GA,
et al: Congenital heart defects in a large, unselected cohort of monochorionic twins. J Perinatol 33:467, 2013
+
Prefumo
F, Cabassa
P, Fichera
A,
et al: Preliminary experience with microwave ablation for selective feticide in monochorionic twin pregnancies. Ultrasound Obstet Gynecol 41:469, 2013
+
Pritchard
JA: Changes in blood volume during pregnancy. Anesthesiology 26: 393, 1965
+
Quarello
E, Molho
M, Ville
Y: Incidence, mechanisms, and patterns of fetal cerebral lesions in twin-to-twin transfusion syndrome. J Matern Fetal Neonatal Med 20:589, 2007
+
Quigley
MM, Cruikshank
DP: Polyhydramnios and acute renal failure. J Reprod Med 19:92, 1977
+
Quinn
KH, Cao
CT, Lacoursiere
Y,
et al: Monoamniotic twin pregnancy: continuous inpatient electronic fetal monitoring—an impossible goal? Am J Obstet Gynecol 204:161, 2011
+
Quintero
RA, Chmait
RH, Murakoshi
T,
et al: Surgical management of twin reversed arterial perfusion sequence. Am J Obstet Gynecol 194:982, 2006
+
Quintero
RA, Morales
WJ, Allen
MH,
et al: Staging of twin-twin transfusion syndrome. J Perinatol 19:550, 1999
+
Quintero
RA, Reich
H, Puder
KS,
et al: Brief report: umbilical-cord ligation in an acardiac twin by fetoscopy at 19 weeks gestation. N Engl J Med 330:469, 1994
+
Rana
S, Hacker
MR, Modest
AM,
et al: Circulating angiogenic factors and risk of adverse maternal and perinatal outcomes in twin pregnancies with suspected preeclampsia novelty and significance. Hypertension 60:451, 2012
+
Ray
B, Platt
MP: Mortality of twin and singleton livebirths under 30 weeks’ gestation: a population-based study. Arch Dis Child Fetal Neonatal Ed 94(2):F140, 2009
+
Rayburn
WF, Lavin
JP Jr, Miodovnik
M,
et al: Multiple gestation: time interval between delivery of the first and second twins. Obstet Gynecol 63:502, 1984
+
Rebarber
A, Roman
AS, Istwan
N,
et al: Prophylactic cerclage in the management of triplet pregnancies. Am J Obstet Gynecol 193:1193, 2005
+
Record
RG, McKeown
T, Edwards
JH: An investigation of the difference in measured intelligence between twins and single births. Ann Hum Genet 34(1):11, 1970
+
Roberts
D, Dalziel
S: Antenatal corticosteroids for accelerating fetal lung maturation for women at risk of preterm birth. Cochrane Database Syst Rev 3:CD004454, 2006
+
Roberts
D, Gates
S, Kilby
M,
et al: Interventions for twin-twin transfusion syndrome: a Cochrane review. Ultrasound Obstet Gynecol 31:701, 2008
+
Robinson
BK, Miller
RS, D’Alton
ME,
et al: Effectiveness of timing strategies for delivery of monochorionic diamniotic twins. Am J Obstet Gynecol 207:53, 2012
+
Robyr
R, Lewi
L, Salomon
LJ,
et al: Prevalence and management of late fetal complications following successful selective laser coagulation of chorionic plate anastomoses in twin-to-twin transfusion syndrome. Am J Obstet Gynecol 194:796, 2006
+
Rode
L, Klein
K, Nicolaides
KH,
et al: Prevention of preterm delivery in twin gestations (PREDICT): a multicenter, randomized, placebo-controlled trial on the effect of vaginal micronized progesterone. Ultrasound Obstet Gynecol 38:272, 2011
+
Roman
A, Papanna
R, Johnson
A,
et al: Selective reduction in complicated monochorionic pregnancies: radiofrequency ablation vs bipolar cord coagulation. Ultrasound Obstet Gynecol 36:37, 2010
+
Ronalds,
GA, De Stavola
BL, Leon
DA: The cognitive cost of being a twin: evidence from comparisons within families in the Aberdeen children of the 1950s cohort study. BMJ 331(7528):1306, 2005
+
Rossi
AC, D’Addario
V: Laser therapy and serial amnioreduction as treatment for twin-twin transfusion syndrome: a metaanalysis and review of literature. Am J Obstet Gynecol 198:147, 2008
+
Rossi
AC, D’Addario
V: Umbilical cord occlusion for selective feticide in complicated monochorionic twins: a systematic review of literature. Am J Obstet Gynecol 200(2):123, 2009
+
Rossi
AC, Mullin
PM, Chmait
RH: Neonatal outcomes of twins according to birth order, presentation and mode of delivery: a systematic review and meta-analysis. BJOG 118(5):523, 2011
+
Rothman
KJ: Fetal loss, twinning and birthweight after oral contraceptive use. N Engl J Med 297:468, 1977
+
Rouse
DJ, Caritis
SN, Peaceman
AM,
et al: A trial of 17alpha-hydroxyprogesterone caproate to prevent prematurity in twins. N Engl J Med 357:454, 2007
+
Rouse
DJ, Skopec
GS, Zlatnik
FJ: Fundal height as a predictor of preterm twin delivery. Obstet Gynecol 81:211, 1993
+
Royal College of Obstetricians and Gynaecologists: Management of monochorionic twin pregnancy. Green-Top Guideline No. 51, December 2008
+
Rydhström
H: Prognosis for twins with birthweight < 1,500 g: the impact of cesarean section in relation to fetal presentation. Am J Obstet Gynecol 163:528, 1990
+
Salomon
LJ, Örtqviast
L, Aegerter
P,
et al: Long-term developmental follow-up of infants who participated in a randomized clinical trial of amniocentesis vs laser photocoagulation for the treatment of twin-to-twin transfusion syndrome. Am J Obstet Gynecol 203(5):444.e1, 2010
+
Scheier
M, Molina
F: Outcome of twin reversed arterial perfusion sequence following treatment with interstitial laser: a retrospective study. Fetal Diagn Ther 31:35, 2012
+
Schreiner-Engel
P, Walther
VN, Mindes
J,
et al: First-trimester multifetal pregnancy reduction: acute and persistent psychologic reactions. Am J Obstet Gynecol 172:544, 1995
+
Sebire
NJ, Foskett
M, Paradinas
FJ,
et al: Outcome of twin pregnancies with complete hydatidiform mole and healthy co-twin. Lancet 359:2165, 2002
+
Senat
MV, Deprest
J, Boulvain
M,
et al: Endoscopic laser surgery versus serial amnioreduction for severe twin-to-twin transfusion syndrome. N Engl J Med 351:136, 2004
+
Senat
MV, Porcher
R, Winer
N,
et al: Prevention of preterm delivery by 17alpha-hydroxyprogesterone caproate in asymptomatic twin pregnancies with a short cervix: a randomized controlled trial. Am J Obstet Gynecol 208(3):194.e1, 2013
+
Simpson
JL, Carson
SA: Multifetal reduction in high-order gestations: a nonelective procedure? J Soc Gynecol Invest 3:1, 1996
+
Simpson
LL: Ultrasound in twins: dichorionic and monochorionic. Semin Perinatol 37(5):348, 2013
+
Slaghekke
F, Kist
WJ, Oepkes
D,
et al: Twin anemia-polycythemia sequence: diagnostic criteria, classification, perinatal management and outcome. Fetal Diagn Ther 27(4):181, 2010
+
Smith
GC, Fleming
KM, White
IR: Birth order of twins and risk of perinatal death related to delivery in England, Northern Ireland, and Wales, 1994–2003: retrospective cohort study. BMJ 334(7593):576, 2007
+
Society for Maternal-Fetal Medicine, Simpson
LL: Twin-twin transfusion syndrome. Am J Obstet Gynecol 208(1):3, 2013
+
Spencer
R: Theoretical and analytical embryology of conjoined twins: part I: embryogenesis. Clin Anat 13:36, 2000
+
Spencer
R: Parasitic conjoined twins: external, internal (fetuses in fetu and teratomas), and detached (acardiacs). Clin Anat 14:428, 2001
+
Sperling
L, Kiil
C, Larsen
LU,
et al: Naturally conceived twins with monochorionic placentation have the highest risk of fetal loss. Ultrasound Obstet Gynecol 28:644, 2006
+
Spitz
L, Kiely
EM: Conjoined twins. JAMA 289:1307, 2003
+
Stein
W, Misselwitz
B, Schmidt
S: Twin-to-twin delivery time interval: influencing factors and effect on short term outcome of the second twin. Acta Obstet Gynecol Scand 87(3):346, 2008
+
Strandskov
HH, Edelen
EW, Siemens
GJ: Analysis of the sex ratios among single and plural births in the total white and colored U.S. populations. Am J Phys Anthropol 4:491, 1946
+
Szymusik
I, Kosinska-Kaczynska
K, Bomba-Opon
D,
et al: IVG versus spontaneous twin pregnancies—which are at higher risk of complications? J Matern Fetal Neonatal Med 25(12):2725, 2012
+
Talauliker
VS, Arulkumaran
S: Reproductive outcomes after assisted conception. Obstet Gynecol Surv 67(9):566, 2012
+
Tan
KL, Goon
SM, Salmon
Y,
et al: Conjoined twins. Acta Obstet Gynecol Scand 50:373, 1971
+
Tannuri
A, Batatinha
J, Velhote
M,
et al: Conjoined twins—twenty years’ experience at a reference center in Brazil. Clinics 68(3):371, 2013
+
Taylor
M, Rebarber
A, Saltzman
DH,
et al: Induction of labor in twin compared with singleton pregnancies. Obstet Gynecol 120(2):297, 2012
+
Thorngren-Jerneck
K, Herbst
A: Low 5-minute Apgar score: a population-based register study of 1 million term births. Obstet Gynecol 98(1):65, 2001
+
Thorson
HL, Ramaeker
DM, Emery
ST: Optimal interval for ultrasound surveillance in monochorionic twin gestations. Obstet Gynecol 117(1):131, 2011
+
To
MS, Fonseca
EB, Molina
FS,
et al: Maternal characteristics and cervical length in the prediction of spontaneous early preterm delivery in twins. Am J Obstet Gynecol 194(5):1360, 2006
+
Trivedi
AN, Gillett
WR: The retained twin/triplet following a preterm delivery–an analysis of the literature. Aust N Z J Obstet Gynaecol 38:461, 1998
+
Varner
MW, Leindecker
S, Spong
CY,
et al: The Maternal-Fetal Medicine Unit Cesarean Registry: trial of labor with a twin gestation. Am J Obstet Gynecol 193:135, 2005
+
Vintzileos
AM, Ananth
CV, Kontopoulos
E,
et al: Mode of delivery and risk of stillbirth and infant mortality in triplet gestations: United States, 1995 through 1998. Am J Obstet Gynecol 192:464, 2005
+
Vora
NL, Ruthazer
R, House
M,
et al: Triplet ultrasound growth parameters. Obstet Gynecol 107:694, 2006
+
Wada
H, Nunogami
K, Wada
T,
et al: Diffuse brain damage caused by acute twin-twin transfusion during late pregnancy. Acta Paediatr Jpn 40:370, 1998
+
Walker
MC, Murphy
KE, Pan
S,
et al: Adverse maternal outcomes in multifetal pregnancies. BJOG 111:1294, 2004
+
Waller
DK, Tita
TN, Annegers
JF: Rates of twinning before and after fortification of foods in the U.S. with folic acid, Texas, 1996 to 1998. Paediatr Perinat Epidemiol 17(4):378, 2003
+
Wen
SW, Demissie
K, Yang
Q,
et al: Maternal morbidity and obstetric complications in triplet pregnancies and quadruplet and higher-order multiple pregnancies. Am J Obstet Gynecol 191:254, 2004
+
Wenstrom
KD, Syrop
CH, Hammitt
DG,
et al: Increased risk of monochorionic twinning associated with assisted reproduction. Fertil Steril 60:510, 1993
+
White
C, Wyshak
G: Inheritance in human dizygotic twinning. N Engl J Med 271:1003, 1964
+
Wright
VC, Chang
J, Jeng
G,
et al: Assisted reproductive technology surveillance–United States, 2005. MMWR 57(5):1, 2008
+
Wolfe
MD, de la Torre
L, Moore
LE,
et al: Is the protocol for induction of labor in singletons applicable to twin gestations? J Reprod Med 58(304):137, 2013
+
Yamasmit
W, Chaithongwongwatthana
S, Tolosa
JE,
et al: Prophylactic oral betamimetics for reducing preterm birth in women with a twin pregnancy. Cochrane Database Syst Rev 3:CD004733, 2005
+
Yang
Q, Wen
SW, Chen
Y,
et al: Occurrence and clinical predictors of operative delivery for the vertex second twin after normal vaginal delivery of the first twin. Am J Obstet Gynecol 192(1):178, 2005a
+
Yang
Q, Wen
SW, Chen
Y,
et al: Neonatal death and morbidity in vertex-nonvertex second twins according to mode of delivery and birth weight. Am J Obstet Gynecol 192(3):840, 2005b
+
Zech
NH, Wisser
J, Natalucci
G,
et al: Monochorionic-diamniotic twins discordant in gender form a naturally conceived pregnancy through postzygotic sex chromosome loss in a 47,XXY zygote. Prenat Diagn 28:759, 2008
+
Zhao
DP, de Villiers
SF, Slaghekke
F,
et al: Prevalence, size, number and localization of vascular anastomoses in monochorionic placentas. Placenta 34:589, 2013