1. Department of Family Medicine Healthcare System Gangnam Center Seoul National University Hospital Seoul Republic of Korea
2. Department of Statistics and Actuarial Science Soongsil University Seoul Republic of Korea
3. Department of Biostatistics, College of Medicine The Catholic University of Korea Seoul Republic of Korea
4. Department of Family Medicine, CHA Bundang Medical Center CHA University Seongnam Republic of Korea
5. Department of Family Medicine Korea University College of Medicine Seoul Republic of Korea
6. Division of Endocrinology and Metabolism, Department of Internal Medicine, Incheon St. Mary's Hospital, College of Medicine The Catholic University of Korea Incheon Republic of Korea
7. Division of Endocrinology and Metabolism, Department of Internal Medicine, Bucheon St. Mary's Hospital, College of Medicine The Catholic University of Korea Bucheon Republic of Korea
8. Division of Endocrinology and Metabolism, Department of Internal Medicine, Kangbuk Samsung Hospital Sungkyunkwan University School of Medicine Seoul Republic of Korea