1. Division of Cardiology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
2. Department of Cardiology, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea
3. Division of Cardiology, Dongsuwon General Hospital, Suwon, Korea
4. Chungnam National University Hospital, Daejeon, Korea
5. Division of Cardiology, Kangwon National University Hospital, Chuncheon, Korea
6. Department of Cardiovascular Medicine, Regional Cardiocerebrovascular Center, Wonkwang University Hospital, Iksan, Korea
7. Division of Cardiology, Department of Internal Medicine, Myongji Hospital, Goyang, Korea
8. Division of Cardiology, Department of Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
9. Department of Internal Medicine, Chosun University Hospital, Gwangju, Korea
10. Department of Internal Medicine, College of Medicine, Chungbuk National University Hospital, Cheongju, Korea
11. Eulji General Hospital, Seoul, Korea
12. Chung-Ang University Hospital, Seoul, Korea
13. Keimyung University Dongsan Medical Center, Daegu, Korea
14. Kwangju Christian Hospital, Gwangju, Korea
15. St Carollo Hospital, Suncheon, Korea
16. Konkuk University Chungju Hospital, Chungju, Korea
17. Korea University Guro Hospital, Seoul, Korea