1. Department of Internal Medicine, College of Medicine, Bucheon St. Mary’s Hospital, The Catholic University of Korea, Bucheon, Korea
2. Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, Korea
3. Department of Endocrinology and Metabolism, Research Institute of Endocrinology, School of Medicine, Kyung Hee University, Seoul, Korea
4. Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea
5. Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
6. Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea
7. Division of Endocrinology and Metabolism, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
8. Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea
9. Department of Internal Medicine, Chonbuk National University Hospital, Jeonju, Korea
10. Department of Internal Medicine, College of Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea