1. Department of Internal Medicine, Division of Endocrinology and Metabolism, Yeouido St Mary’s Hospital (M.K.K., H.-S.K.), College of Medicine, The Catholic University of Korea, Seoul.
2. Department of Medical Statistics (K.H.), College of Medicine, The Catholic University of Korea, Seoul.
3. Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC (Y.-M.P.).
4. Department of Statistics and Actuarial Science, Soongsil University, Seoul, Korea (G.K.).
5. Department of Internal Medicine, Division of Endocrinology and Metabolism, Seoul St Mary’s Hospital (K.-H.Y., S.-H.L.), College of Medicine, The Catholic University of Korea, Seoul.
6. Department of Medical Informatics (K.-H.Y.), College of Medicine, The Catholic University of Korea, Seoul.