1. Department of Medicine, Division of Endocrinology and Metabolism, Emory University School of Medicine (T.R.Z.), Atlanta, Georgia 30322
2. the Department of Surgery, Hospital of the University of Pennsylvania (M.P.M., J.L.R.), Philadelphia, Pennsylvania 19104
3. Joslin Research Laboratory, Harvard Medical School (J.C.C., R.J.S.), Boston, Massachusetts 02215