1. Department of Psychiatry, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea.
2. Division of Endocrinology & Metabolism, Department of Internal medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea.
3. National Health Insurance Service, Wonju, Korea.
4. Division of Endocrinology and Metabolism, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
5. Department of Biostatistics, College of Medicine, The Catholic University of Korea, Seoul, Korea.
6. Department of Internal Medicine, Cardiovascular and Metabolic Disease Center, Inje University Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea.