1. Division of Endocrinology and Metabolism (H.J.Y., H.C.H., H.Y.C., S.H.B., K.M.C.), Department of Internal Medicine, Korea University, Seoul 152-703, Korea;
2. Department of Biostatistics (S.Y.H.), College of Medicine, Korea University, Seoul 152-703, Korea;
3. Guro-Gu Public Health Center (G. J.C., T.G.H.), Seoul 152-055, Korea;
4. Department of Family Medicine (S.M.K.), College of Medicine, Korea University, Seoul 152-703, Korea;
5. Department of Medicine (M.B.), University of Leipzig, Leipzig, Germany;
6. AdipoGen, Inc (B.-S.Y.), 7-50 Songdo-dong, Yeonsu-gu, Incheon 406-840, Korea