1. Department of Medicine (L.L.S., A.R.C., N.J.) and Division of Endocrinology, Diabetes, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
2. Department of Biostatistics (A.M.A.), University of Washington, Seattle, Washington 98155
3. Department of Epidemiology (L.P.F.), Mailman School of Public Health, Columbia University, New York, New York 10032
4. Metabolism (A.R.C.), University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104