1. Phoenix Epidemiology and Clinical Research Branch (M.S.T., N.P., S.B., J.K.), National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Phoenix, Arizona 85106;
2. Medical Neuroendocrinology Branch (K.P.), National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892