1. Department of Internal Medicine Yonsei University College of Medicine Seoul South Korea
2. Department of Internal Medicine, Hallym University Kangdong Sacred Heart Hospital Hallym University College of Medicine Seoul South Korea
3. Division of Endocrinology and Metabolism, Department of Internal Medicine, Hallym University Kangnam Sacred Heart Hospital Hallym University College of Medicine Seoul South Korea
4. Division of Endocrinology and Metabolism, Department of Internal Medicine Korea University Guro Hospital, Korea University College of Medicine Seoul South Korea
5. Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine Korea University Seoul South Korea
6. Division of Endocrinology and Metabolism, Department of Internal Medicine, Daejeon Eulji Medical Center Eulji University School of Medicine Daejeon South Korea
7. Division of Endocrinology and Metabolism, Department of Internal Medicine, Uijeongbu St. Mary's Hospital, College of Medicine The Catholic University of Korea Seoul South Korea
8. Division of Endocrinology and Metabolism, Department of Internal Medicine, Wonju Severance Christian Hospital Yonsei University Wonju College of Medicine Wonju South Korea
9. Department of Endocrinology and Metabolism Kyung Hee University School of Medicine Seoul South Korea
10. Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine Inje University Busan South Korea
11. Division of Endocrinology and Metabolism, Department of Internal Medicine, Yeouido St. Mary's Hospital, College of Medicine The Catholic University of Korea Seoul South Korea
12. Department of Endocrinology Kosin University Gospel Hospital, Kosin University College of Medicine Busan South Korea
13. Division of Endocrinology and Metabolism, Department of Internal Medicine Soonchunhyang University Hospital, Soonchunhyang University College of Medicine Seoul South Korea
14. Department of Internal Medicine Yeungnam University College of Medicine Daegu South Korea
15. Department of Internal Medicine Seoul National University Bundang Hospital Seongnam South Korea