1. Division of Endocrinology and Metabolism, Department of Internal Medicine, Yeouido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
2. Department of Internal Medicine, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea
3. Department of Internal Medicine, Hallym University Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea
4. Division of Endocrinology and Metabolism, Department of Internal Medicine, Hanyang University Hospital, Seoul, Korea
5. Department of Internal Medicine, Catholic University of Daegu School of Medicine, Daegu, Korea
6. Department of Endocrinology and Metabolism, Kyung Hee University School of Medicine, Seoul, Korea
7. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
8. Department of Endocrinology and Metabolism, Department of Internal Medicine, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea
9. Medical Department, Sanofi-Aventis Korea, Seoul, Korea
10. Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea
11. Division of Endocrinology and Metabolism, Department of Internal Medicine, Jeonbuk National University Hospital, Jeonbuk National University Medical School, Jeonju, Korea