@inbook{1116802374, author={Klaus Wolff and Richard Allen Johnson and Arturo P. Saavedra}, title={Prefacio}, booktitle={Fitzpatrick. Atlas de DermatologĂ­a ClĂ­nica, 7e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2015}, url={accessmedicina.mhmedical.com/content.aspx?aid=1116802374} }