@inbook{1120607103,
author={William W. Hay and Myron J. Levin and Judith M. Sondheimer and Robin R. Deterding},
title={Prólogo},
booktitle={Diagnóstico y tratamiento pediátricos, 19e},
publisher={McGraw-Hill Education},
address={New York, NY},
year={2010},
url={accessmedicina.mhmedical.com/content.aspx?aid=1120607103}
}