@inbook{1174919162, author={F. Charles Brunicardi and Dana K. Andersen and Timothy R. Billiar and David L. Dunn and Lillian S. Kao and John G. Hunter and Jeffrey B. Matthews and Raphael E. Pollock}, title={Prefacio}, booktitle={Schwartz. Principios de CirugĂ­a, 11e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2020}, url={accessmedicina.mhmedical.com/content.aspx?aid=1174919162} }