1. Heart Institute, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
2. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Division of Cardiology, Department of Medicine, Chonnam National University Hospital, Gwangju, Korea.
4. Division of Cardiology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
6. Department of Cardiology, Cardiovascular Center, Korea University Anam Hospital, Seoul, Korea.
7. Department of Medicine, Keimyung University College of Medicine, Daegu, Korea.
8. Department of Internal Medicine, Wonkwang University Sanbon Hospital, Sanbon, Korea.
9. Division of Cardiology, Department of Internal Medicine, Sungkyunkwan University Samsung Changwon Hospital, Changwon, Korea.
10. Division of Cardiology, Department of Internal Medicine, Kosin University Gospel Hospital, Busan, Korea.
11. Department of Cardiology, Myongji Hospital, Goyang, Korea.
12. Cardiovascular Center, Korea University Guro Hospital, Seoul, Korea.
13. Division of Cardiology, The Catholic University of Korea, Daejeon St. Mary's Hospital, Daejeon, Korea.
14. Department of Cardiology, Chung-Ang University Hospital, Seoul, Korea.
15. Cardiovascular Center, GangNeung Asan Hospital, Gangneung, Korea.
16. Division of Cardiology, Ajou University Medical Center, Suwon, Korea.
17. Division of Cardiology, Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu, Korea.
18. Department of Cardiology, Dong-A University Medical Center, Busan, Korea.