1. Division of Endocrinology and Metabolism; Department of Internal Medicine; Samsung Medical Center; Seoul Korea
2. Division of Endocrinology and Metabolism; Department of Internal Medicine; Dong-A University Medical Center; Busan Korea
3. Division of Endocrinology and Metabolism; Department of Internal Medicine; Kangbuk Samsung Hospital; Sungkyunkwan University School of Medicine; Seoul Korea
4. Division of Endocrinology and Metabolism; Department of Internal Medicine; Gil Medical Center; Gachon University School of Medicine; Incheon Korea