1. Department of Physiology, West Virginia University (S.M.H.), Morgantown, West Virginia 26506
2. Department of Medicine, Division of Endocrinology, Beth Israel Deaconess Medical Center and Harvard Medical School (D.D.P., H.M., C.B., K.E.-H., J.S.F.), Boston, Massachusetts 02215
3. Geriatric Research, Education, and Clinical Center, Veteran Affairs Medical Center and Department of Internal Medicine, Division of Geriatrics, St. Louis University School of Medicine (W.A.B.), St. Louis, Missouri 63104