1. University Department of Growth and Reproduction (N.E.S.), Rigshospitalet, Blegdamsvej, DK-2100 Copenhagen, Denmark
2. Departments of Physiology and Pediatrics (J.T.), University of Turku, 20520 Turku, Finland
3. Department of Women's and Children's Health Pediatric Endocrinology Unit (O.S.), Karolinska Institute at Karolinska University Hospital, 171 65 Stockholm, Sweden
4. Divisions of Adolescent Medicine and Endocrinology (C.M.G.), Children's Hospital Boston, Boston, Massachusetts 02115
5. Division of Pediatric Endocrinology (S.D.), Johns Hopkins University, Baltimore, Maryland 21287
6. Department of Pediatrics (M.D.), Michigan State University Kalamazoo Center for Medical Studies, Kalamazoo, Michigan 49008