1. Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea.
2. Department of Cardiology, Seoul National University Hospital, Seoul, Korea.
3. Department of Cardiology, Samsung Medical Center, Sungkyunkwan University, Seoul, Korea.
4. Department of Cardiology, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.
5. Cardiovascular Center, Korea University Guro Hospital, Seoul, Korea.
6. Department of Cardiology, Kyungpook National University Hospital, Daegu, Korea.
7. Department of Cardiology, Kyung Hee University Hospital at Gangdong, Seoul, Korea.
8. Department of Cardiology, Pusan National University Hospital, Busan, Korea.
9. Division of Cardiology, Yeungnam University Hospital, Daegu, Korea.
10. Division of Cardiology, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea.
11. Department of Cardiology, Chunbuk National University Hospital, Jeonju, Korea.
12. Department of Cardiology, Jeju National University Hospital, Jeju, Korea.
13. Cardiovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea.
14. Department of Cardiology, Keimyung University Dongsan Medical Center, Daegu, Korea.
15. Department of Cardiology, Chungnam National University Hospital, Daejeon, Korea.
16. Department of Cardiology, Chungbuk National University Hospital, Cheongju, Korea.
17. Department of Cardiology, Inje University Haeundae Paik Hospital, Busan, Korea.
18. Department of Cardiology, Wonkwang University Hospital, Iksan, Korea.
19. Department of Cardiology, Gachon University Gil Medical Center, Incheon, Korea.
20. Department of Cardiology, Kyungsang National University Hospital, Jinju, Korea.