1. Division of Endocrinology and Metabolism, Department of Internal Medicine, Kangbuk Samsung Hospital Sungkyunkwan University School of Medicine Seoul Republic of Korea
2. Department of Internal Medicine, CHA Bundang Medical Center CHA University School of Medicine Seongnam Republic of Korea
3. Department of Internal Medicine, Asan Medical Center University of Ulsan College of Medicine Seoul Republic of Korea
4. Asan Diabetes Center, Asan Medical Center Seoul Republic of Korea
5. Division of Biostatistics, Department of R&D Management, Kangbuk Samsung Hospital Sungkyunkwan University School of Medicine Seoul Republic of Korea
6. Global Medical and Clinical Affairs, Medtronic Diabetes Northridge California USA