1. Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea
2. Department of Internal Medicine, Chung-Ang University College of Medicine, Seoul, Korea
3. Department of Endocrinology and Metabolism, Chosun University Hospital, Chosun University School of Medicine, Gwangju, Korea
4. Department of Internal Medicine, College of Medicine, Kyung Hee University, Seoul, Korea
5. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Korea
6. Department of Internal Medicine, Nowon Eulji Medical Center, Eulji University, Seoul, Korea
7. Department of Internal Medicine, Center for Thyroid Cancer, National Cancer Center, Goyang, Korea
8. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
9. Division of Endocrinology & Metabolism, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
10. Department of Internal Medicine, CHA Ilsan Medical Center, CHA University School of Medicine, Goyang, Korea
11. Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea