1. Reproductive Endocrine Unit, Department of Medicine, Massachusetts General Hospital and Harvard Reproductive Endocrine Sciences Center (N.D.S., S.B.S., C.K.W., M.G.A., L.P., V.A.H., A.A.D., K.A.M., W.F.C., N.P., J.E.H.), Harvard Medical School, Boston, Massachusetts 02114;
2. Division of Endocrinology (N.D.S.), Children's Hospital Boston, Boston, Massachusetts 02115;
3. Institute of Human Genetics (R.Q.), University of Newcastle-upon-Tyne, Newcastle NE2 4HH, United Kingdom;
4. Institute of Maternal and Child Research (V.M.) Faculty of Medicine, University of Chile, Santiago, Chile
5. Department of Pediatrics (P.M.M.), Faculty of Medicine, University of Chile, Santiago, Chile
6. Center for Human Genetic Research, Massachusetts General Hospital and Department of Genetics (J.F.G.), Harvard Medical School, Boston, Massachusetts 02114;