A Johns Hopkins Press Health Book

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.

Francis Mark Mondimore, M.D.

Freeman Miller, M.D., and Steven J. Bachrach, M.D.with Marilyn L. Boos, R.N.C., M.S., Kirk Dabney, M.D., Linda Duffy, B.S., P.A.-C., Robin C. Meyers, M.P.H., R.D., Douglas T. Pearson, Ph.D., Kathleen Trzcinski, R.N., M.S.N., C.R.N.P., Rhonda S. Walter, M.D., and Joan Lenett Whinston

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

Rita R. Kalyani, MD, MHS, Mark D. Corriere, MD, Thomas W. Donner, MD, and Michael W. Quartuccio, MD

Edward A. Bell, PharmD, BCPS

Scott H. Sicherer, MDintroduction by Hugh A. Sampson, MD, Jaffe Food Allergy Institute, Icahn School of Medicine at Mount Sinai