@inbook{1192297143, author={F. Gary Cunningham and Kenneth J. Leveno and Jodi S. Dashe and Barbara L. Hoffman and Catherine Y. Spong and Brian M. Casey}, title={Prólogo}, booktitle={Williams Obstetricia, 26e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2021}, url={accessmedicina.mhmedical.com/content.aspx?aid=1192297143} }