1. Divisions of Endocrinology, Diabetes, Metabolism, Nutrition, and Internal Medicine (V.L., W.F.Y.), Rochester, Minnesota 55905
2. the Division of Endocrinology (Q.G.), Chinese PLA General Hospital, Beijing, People's Republic of China 100853
3. the Division of Gastroenterologic and General Surgery (C.S.G., G.B.T., D.R.F., M.L.R.), Mayo Clinic, Rochester, Minnesota 55905