1. Division of Endocrinology, Diabetes, and Metabolism (P.W.L.), Johns Hopkins University School of Medicine, Baltimore, Maryland 21287
2. Division of Diabetes, Endocrinology, and Metabolism (A.B.), Baylor College of Medicine, Houston, Texas 77030
3. Division of Endocrinology (A.D.), Veterans Affairs New York Harbor Health Care System and New York University Langone Medical Center, New York, New York 10016
4. Research Program in Men's Health: Aging and Metabolism (S.B.), Brigham and Women's Hospital, Boston, Massachusetts 02115