1. Unit on Growth and Obesity (A.F.F., N.A., M.D.R., J.C.H., K.R.T., S.Z.Y., J.A.Y.), National Institutes of Health, Bethesda, Maryland 20892
2. Developmental Endocrinology Branch, and Division of Epidemiology, Statistics, and Prevention Research (A.V., J.T.), National Institute of Child Health and Human Development; National Institutes of Health, Bethesda, Maryland 20892
3. Division of Digestive Diseases and Nutrition (S.Z.Y.), National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892