1. Department of Internal Medicine and Cardiovascular Center, Seoul National University Hospital
2. Division of Cardiology, Department of Internal Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine
3. Department of Internal Medicine and Cardiovascular Center, Chosun University Hospital, University of Chosun College of Medicine
4. National Maritime Medical Center
5. Department of Cardiology, Yeungnam University Medical Center
6. School of Medicine, Kyungpook National University
7. Cardiology Division, Department of Internal Medicine, Chungbuk National University Hospital
8. Department of Internal Medicine, Kyunghee University College of Medicine
9. Department of Internal Medicine and Heart Center, Chonnam National University Hospital