1. Division of Endocrinology and Metabolism; Department of Medicine; Samsung Medical Center; Sungkyunkwan University School of Medicine; Seoul Korea
2. Division of Endocrinology and Metabolism; Department of Internal Medicine; Gyeongsang National University Changwon Hospital; Changwon Korea
3. Division of Endocrinology and Metabolism; Department of Internal Medicine; Dong-A University Medical Center; Dong-A University College of Medicine; Busan Korea
4. Division of Endocrinology and Metabolism; Department of Internal Medicine; Asan Medical Center; University of Ulsan College of Medicine; Seoul Korea
5. Division of Endocrinology and Metabolism; Department of Internal Medicine; Kangbuk Samsung Hospital; Sungkyunkwan University School of Medicine; Seoul Korea
6. Department of Endocrinology and Metabolism; Seoul St. Mary's Hospital; The Catholic University of Korea; Seoul Korea
7. Division of Endocrinology and Metabolism; Department of Internal Medicine; Yonsei University College of Medicine; Seoul Korea
8. Department of Clinical Research Design and Evaluation; Samsung Advanced Institute for Health Sciences and Technology; Sungkyunkwan University; Seoul Korea