1. Division of Endocrinology and Metabolism, Department of Internal Medicine Inha University College of Medicine Incheon Republic of Korea
2. Department of Biomedical Sciences Inha University College of Medicine Incheon Republic of Korea
3. Division of Endocrinology and Metabolism, Department of Internal Medicine Yonsei University College of Medicine Seoul Republic of Korea
4. Huh's Diabetes Center Seoul Republic of Korea