1. Division of Endocrinology and Metabolism; Department of Medicine; Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
2. Division of Endocrinology and Metabolism; Department of Medicine; Konkuk University Medical Center; Konkuk University School of Medicine; Seoul Korea
3. Department of Endocrinology; Inha University School of Medicine; Incheon Korea
4. Division of Endocrinology and Metabolism; Department of Medicine; Gyeongsang National University School of Medicine; Jinju Korea
5. Division of Endocrinology and Metabolism; Department of Medicine; Dong-A University Medical Center; Dong-A University School of Medicine; Busan Korea
6. Division of Endocrinology and Metabolism; Department of Medicine; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea