A Johns Hopkins Press Health Book

Gil Yosipovitch, M.D., and Shawn G. Kwatra, M.D.

Francis Mark Mondimore, M.D.

Patrick C. Walsh, M.D., and Janet Farrar Worthington

North American Society for Pediatric Gastroenterology, Hepatology and NutritionEditors-in-Chief Maria Oliva-Hemker, M.D., David Ziring, M.D., and Athos Bousvaros, M.D.

Edward E. Wallach, MD, and Esther Eisenberg, MD, MPH

edited by Adam E. M. Eltorai, PhD, Alan H. Daniels, MD, Derek R. Jenkins, MD, and Lee E. Rubin, MD

Lisa M. Shulman, MD

Susan J. Noonan, MD, MPHforeword by Jerrold F. Rosenbaum, MD, and Timothy J. Petersen, PhD

Edward A. Bell, PharmD, BCPS