1. Division of Cardiology, Department of Medicine, Heart Vascular Stroke Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Division of Cardiology, Department of Internal Medicine, Gil Hospital, Gachon University of Medicine and Science, Incheon, Korea.
3. Division of Cardiology, Department of Internal Medicine, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea.
4. Department of Internal Medicine, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
5. Division of Cardiology, Department of Internal Medicine, Gyeongsang National University Hospital, Gyeongsang National University School of Medicine, Jinju, Korea.
6. Department of Cardiology, Kyung Hee University School of Medicine, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
7. Division of Cardiology, Keimyung University Dongsan Medical Center, Daegu, Korea.
8. Division of Cardiology, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
9. Department of Internal Medicine, Wonkwang University Hospital, Institute of Wonkwang Medical Science, Iksan, Korea.
10. Division of Cardiology, Department of Internal Medicine, Pusan National University School of Medicine, Busan, Korea.
11. Division of Cardiology, Department of Internal Medicine, Cardiovascular Center, Seoul National University College of Medicine, Seoul, Korea.
12. Division of Cardiology, Department of Internal Medicine, Seoul National University and Cardiovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea.
13. Division of Cardiology, Department of Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
14. Department of Cardiology, Ajou University School of Medicine, Suwon, Korea.
15. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
16. Department of Cardiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
17. Division of Cardiology, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
18. Division of Cardiology, Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
19. Division of Cardiology, Department of Internal Medicine, Inha University College of Medicine, Incheon, Korea.
20. Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea.
21. Division of Cardiology, Department of Internal Medicine, Chungnam National University Hospital, Chungnam National University School of Medicine, Daejeon, Korea.
22. Division of Cardiology, Department of Internal Medicine, Chungbuk National University School of Medicine, Cheongju, Korea.
23. Department of Internal Medicine, Cardiovascular Center, Kyung Hee University Medical Center, Seoul, Korea.