1. Cardiovascular Center, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.
2. Division of Cardiology, Department of Internal Medicine, Kangwon National University, Chuncheon, Korea.
3. Division of Cardiology, Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, Korea.
4. Division of Cardiology, Department of Internal Medicine, Bucheon St. Mary’s Hospital, Bucheon, Korea.
5. Division of Cardiology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
6. Division of Cardiology, Department of Internal Medicine, St. Vincent’s Hospital, Suwon, Korea.
7. Division of Cardiology, Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea.
8. Division of Cardiology, Department of Internal Medicine, Ulsan University Hospital, Ulsan, Korea.
9. Division of Cardiology, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
10. Division of Cardiology, Department of Internal Medicine, Kangdong Sacred Heart Hospital, Seoul, Korea.
11. Division of Cardiology, Department of Internal Medicine, Chungnam National University Hospital, Daejeon, Korea.
12. Division of Cardiology, Department of Internal Medicine, Daegu Catholic University Medical Center, Daegu, Korea.
13. Division of Cardiology, Department of Internal Medicine, Chonnam University Hospital, Gwangju, Korea.
14. Division of Cardiology, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.