1. Department of Internal Medicine, Choon Hae Hospital, Busan, Korea.
2. Division of Endocrinology and Metabolism, Department of Internal Medicine, Dong-A University Medical Center, Busan, Korea.
3. Department of Pharmacology, Dong-A University College of Medicine, Busan, Korea.
4. Diabetes Center, Dong-A University Medical Sciences Research Institute, Busan, Korea.
5. Department of Internal Medicine, Sevrance UVA Surgery, Busan, Korea.
6. Division of Endocrinology and Metabolism, Department of Internal Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.