1. Harvard Medical School (M.T.H., R.R.M.), Boston, Massachusetts 02115
2. Institute for Aging Research (M.T.H., C.E.M., R.R.M.), Hebrew SeniorLife, Boston, Massachusetts 02131
3. New England Research Institutes (H.J.L., A.B.A., J.B.M.), Watertown, Massachusetts 02472
4. Section of Endocrinology, Diabetes, and Nutrition (T.C.C., M.F.H.), Department of Medicine, Boston University School of Medicine, Boston, Massachusetts 02118