1. Molecular and Clinical Hematology Branch (S.P.), National Institute of Diabetes, Digestive, and Kidney Disease, Bethesda, Maryland 20892
2. Inter-Institute Endocrinology Training Program (S.P., C.A.S.), National Institute of Child Health and Human Development/National Institute of Diabetes, Digestive, and Kidney Disease, Bethesda, Maryland 20892
3. Section on Endocrinology and Genetics (L.K., M.K., C.A.S.), Developmental Endocrinology Branch, National Institute of Child Health and Human Development, Bethesda, Maryland 20892
4. Department of Diagnostic Radiology (N.J.P.), Warren Grant Magnuson Clinical Center, National Institutes of Health, Bethesda, Maryland 20892