1. Division of Cardiology, Department of Internal Medicine, St. Paul’s Hospital, The Catholic University of Korea, Seoul, Korea
2. Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
3. Division of Cardiology, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University, Seoul, Korea
4. Division of Cardiology, Department of Internal Medicine, Severance Cardiovascular Hospital, Yonsei University, Seoul, Korea
5. Division of Cardiology, Department of Internal Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Korea
6. Division of Cardiology, Department of Internal Medicine, Korea University Guro Hospital, Seoul, Korea
7. Division of Cardiology, Department of Internal Medicine, Bundang Seoul National University Hospital, Seongnam, Korea
8. Division of Cardiology, Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Korea
9. Division of Cardiology, Department of Internal Medicine, Hanyang University Hospital, Seoul, Korea
10. Division of Cardiology, Department of Internal Medicine, Korea University Anam Hospital, Seoul, Korea
11. Division of Cardiology, Department of Internal Medicine, Hanyang University Guri Hospital, Guri, Korea
12. Division of Cardiology, Department of Internal Medicine, Gil Hospital, Gachon University, Incheon, Korea
13. Division of Cardiology, Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
14. Division of Cardiology, Department of Internal Medicine, Pusan National University Hospital, Pusan, Korea
15. Division of Cardiology, Department of Internal Medicine, Seoul St. Mary’s Hospital, The Catholic University of Korea, Seoul, Korea
16. Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea
17. Division of Cardiology, Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea
18. Division of Cardiology, Department of Internal Medicine, Yeungnam University Hospital, Daegu, Korea