1. Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea.
2. Department of Internal Medicine, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
3. Department of Internal Medicine, CHA Gangnam Medical Center, CHA University, Seoul, Korea.
4. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
6. Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
7. Division of Endocrinology, Department of Internal Medicine, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
8. Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea.
9. Department of Internal Medicine, Catholic University of Daegu School of Medicine, Daegu, Korea.
10. Department of Internal Medicine, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Korea.
11. Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea.
12. Division of Endocrinology and Metabolism, Department of Internal Medicine, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Goyang, Korea.
13. Department of Endocrinology, Inha University School of Medicine, Incheon, Korea.