1. Reproductive Endocrine Unit (E.E.M., N.D.S., K.M.K., T.O.T.-M., M.A.Y., P.M.S., J.E.H.), Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114
2. Division of Reproductive Endocrinology and Infertility (E.E.M.), Department of Obstetrics and Gynecology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
3. Division of Endocrinology (N.D.S.), Children's Hospital Boston, Boston, Massachusetts 02115