1. The Pediatric Endocrine Unit (M.M.L., C.C.S.) , Massachusetts General Hospital, Boston, Massachusetts 02114
2. Pediatric Surgical Research Laboratory (P.T.M., P.K.D., D.T.M.), Massachusetts General Hospital, Boston, Massachusetts 02114
3. Population Council and The Rockefeller University (C.M.S., M.P.H.), New York, New York 10021
4. Department of Pathology (F.I.P.), Massachusetts General Hospital, Boston, Massachusetts 02114