1. Tupper Research Institute and Department of Medicine, Division of Endocrinology, Diabetes, Metabolism and Molecular Medicine, New England Medical Center (G.L., R.M.L.), Boston, Massachusetts 02111
2. University of Massachusetts Medical School (C.H.E.), Worcester, Massachusetts 01655
3. Department of Medicine, Division of Endocrinology, Beth Israel-Deaconess Medical Center (R.S.A., J.S.F.), Boston, Massachusetts 02111
4. Department of Neuroscience (R.M.L.), Tufts University School of Medicine, Boston, Massachusetts 02111