1. Reproductive Endocrine Unit (R.L., J.C.P., D.Z., Y.-M.C., A.M., F.C., S.B.S.), Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts 02114
2. Hospital for Children and Adolescents (R.L.), University of Helsinki, 00029 HUS, Finland
3. Division of Endocrinology (Y.-M.C.), Department of Medicine, Children’s Hospital Boston, Boston, Massachusetts 02115
4. Department of Anatomy and Neurobiology (W.W.L., G.E.H.), School of Medicine, University of Maryland, Baltimore, Maryland 21209