1. From the Department of Pediatrics, Maimonides Medical Center, Brooklyn, NY; Service de Gastroenterologie et Nutrition and Service d'Endocrinologie, Departement de Pediatrie, Hôpital Necker Enfants Malades, Paris; Service de Biochimie and Hôpital Saint Antoine, Paris; and Research Unit on Human Nutrition and Growth, VII Division, University of Barcelona, Reus, Spain.