1. Neuroendocrine Unit (K.E.A., L.P., G.G., M.S., M.M.), Boston, Massachusetts 02114
2. Division of Sports Medicine (K.E.A.), Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02116
3. Division of Biostatistics (H.L.), Boston, Massachusetts 02114
4. Department of Medicine, Division of Adolescent and Young Adult Medicine (M.G.), Boston, Massachusetts 02114
5. Pediatric Endocrine Unit (M.M.), Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114