1. Division of Endocrinology, Department of Internal Medicine, Soonchunhyang University Gumi Hospital, Soonchunhyang University School of Medicine, Gumi, Korea
2. Department of Family Medicine, Korea University College of Medicine, Seoul, Korea
3. Department of Biostatistics, The Catholic University of Korea, Seoul, Korea
4. Division of Endocrinology and Metabolism, Department of Internal Medicine, Bucheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Korea
5. Division of Endocrinology and Metabolism, Department of Internal Medicine, Yeouido St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
6. Division of Endocrinology and Metabolism, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea