1. From the Molecular and Clinical Nutrition Section, Digestive Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, MD (SJP, YW, and ML); the Diagnostic Radiology Department, Clinical Center, National Institutes of Health, Bethesda, MD (JLD); the National Heart, Lung, and Blood Institute, Bethesda, MD (JG); and the Developmental Endocrinology Branch (DAP), Na