1. Division of Endocrinology, Diabetes, and Nutrition (A.D.C.), Boston University School of Medicine, Boston, Massachusetts 02118
2. Division of Endocrinology (S.S.), University of Illinois-Chicago, Chicago, Illinois 60612
3. Department of Obstetrics and Gynecology (R.S.L.), Pennsylvania State University College of Medicine, Hershey, Pennsylvania 17033
4. Division of Endocrinology, Metabolism and Molecular Medicine (A.D.), Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611