1. Division of Cardiology, Department of Internal Medicine, Cardiovascular Center, Korea University Anam Hospital, Seoul, Korea.
2. Division of Cardiology, Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
3. Division of Cardiology, Department of Internal Medicine, Korea University Guro Hospital, Seoul, Korea.
4. Division of Cardiology, Department of Internal Medicine, Kyung Hee University Medical Center, Seoul, Korea.
5. Division of Cardiology, Department of Internal Medicine, Gwangju Christian Hospital, Gwangju, Korea.
6. Division of Cardiology, Department of Internal Medicine, Eulji University General Hospital, Seoul, Korea.
7. Division of Cardiology, Department of Internal Medicine, The Catholic University of Korea Bucheon St. Mary’s Hospital, Bucheon, Korea.
8. Division of Cardiology, Department of Internal Medicine, Ajou University Hospital, Suwon, Korea.
9. Division of Cardiology, Department of Internal Medicine, Inha University Hospital, Incheon, Korea.
10. Division of Cardiology, Department of Internal Medicine, Soonchunhyang University Hospital Cheonan, Cheonan, Korea.
11. Division of Cardiology, Department of Internal Medicine, Hallym University Medical Center, Chuncheon, Korea.
12. Division of Cardiology, Department of Internal Medicine, Yeungnam University Hospital, Daegu, Korea.
13. Division of Cardiology, Department of Internal Medicine, Myongji Hospital, Seoul, Korea.
14. Division of Cardiology, Department of Internal Medicine, Anyang Sam Hospital, Anyang, Korea.