1. Division of Endocrinology, Metabolism and Diabetes, and Cardiology (R.H.E.), Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado 80045;
2. Division of Metabolism, Endocrinology and Nutrition (S.E.K.), Department of Medicine, VA Puget Sound Health Care System and University of Washington, Seattle, Washington 98108;
3. Department of Internal Medicine (E.F.), University of Pisa, 56100 Pisa, Italy;
4. Joslin Diabetes Center and Harvard Medical School (A.B.G.), Boston, Massachusetts 02115;
5. Clinical Research Center and Diabetes Center (D.M.N.), Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114;
6. Division of Metabolism, Endocrinology and Nutrition (M.W.S.), Department of Medicine, University of Washington, Seattle, Washington 98109;
7. Division of Endocrinology and the Hallett Center for Diabetes and Endocrinology (R.J.S.), Alpert Medical School of Brown University, Providence, Rhode Island 02914;
8. Translational Research Institute for Metabolism and Diabetes (S.R.S.), Florida Hospital–Sanford/Burnham Research Institute, Orlando, Florida 32827