1. Division of Endocrinology and Metabolism; Department of Internal Medicine; University of Ulsan College of Medicine; Seoul Korea
2. Diabetes Center; Asan Medical Center; Seoul Korea
3. Division of Endocrinology and Metabolism; Department of Internal Medicine; Korea University College of Medicine Ansan Hospital; Ansan Korea
4. Division of Endocrinology and Metabolism; Department of Internal Medicine; Veterans Health Service Medical Center; Seoul Korea
5. Department of Convergence Medicine; University of Ulsan College of Medicine; Seoul Korea