1. Department of Internal Medicine (S.-K.K., S.W.P., Y.-W.C.), CHA Bundang Medical Center, CHA University, Seongnam 463-712, Korea
2. Huh's Diabetes Center and the 21st Century Diabetes and Vascular Research Institute (Y.J.C., B.W.H., K.B.H.), Seoul 121-806, Korea
3. Department of Internal Medicine (E.J.L.), Yonsei University College of Medicine, Seoul 120-749, Korea