1. Cardiovascular Center, Korea University Guro Hospital, Seoul, Korea.
2. Cardiovascular Research Institute, Korea University, Seoul, Korea.
3. Division of Cardiology, Department of Internal Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
4. Division of Cardiology, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea.
5. Division of Cardiology, Department of Internal Medicine, Inha University College of Medicine, Incheon, Korea.
6. Department of Cardiology, Hallym Hospital, Incheon, Korea.
7. Department of Cardiology, Na-Eun Hospital, Incheon, Korea.
8. Division of Cardiology, Department of Internal Medicine, Sejong General Hospital, Bucheon, Korea.
9. Division of Cardiology, Department of Internal Medicine, Kangwon National University School of Medicine, Chuncheon, Korea.
10. Division of Cardiology, Department of Internal Medicine, Eulji University Hospital, Daejeon, Korea.
11. Division of Cardiology, Department of Internal Medicine, Medical Research Institute, Pusan National University Hospital, Busan, Korea.
12. Division of Cardiology, Department of Internal Medicine, Nowon Eulji Medical Center, Eulji University, School of Medicine, Seoul, Korea.
13. Division of Cardiology, Department of Internal Medicine, School of Medicine, Soonchunhyang University Gumi Hospital, Gumi, Korea.