1. Department of Internal Medicine; Keimyung University School of Medicine; Daegu Korea
2. Department of Internal Medicine; Hallym University College of Medicine; Seoul Korea
3. Department of Internal Medicine; Yonsei University College of Medicine; Seoul Korea
4. Department of Endocrinology and Metabolism; Chonbuk National University Hospital; Jeonju Korea
5. Department of Internal Medicine; Dongguk University College of Medicine; Goyang Korea
6. Department of Internal Medicine; Konkuk University School of Medicine; Seoul Korea
7. Department of Internal Medicine; Yonsei University Wonju College of Medicine; Wonju Korea
8. Paik Institute for Clinical Research; Department of Internal Medicine; College of Medicine; Inje University; Busan Korea
9. Department of Internal Medicine; Seoul National University Bundang Hospital; Seongnam Korea
10. Division of Endocrinology and Metabolism; Department of Internal Medicine; Korea University College of Medicine; Seoul Korea