1. Department of Internal Medicine, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
2. Division of Cardiology, Department of Internal Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea.
3. Department of Cardiovascular Medicine, Soonchunhyang Seoul Hospital, Seoul, Korea.
4. Division of Cardiology, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
5. Department of Occupational and Environmental Medicine, College of Medicine Dong-A University, Busan, Korea.
6. Department of Preventive Medicine, College of Medicine Dong-A University, Busan, Korea.
7. Department of Cardiovascular Medicine, Incheon St. Mary's Hospital, The Catholic University of Korea, Incheon, Korea.
8. Department of Cardiovascular Medicine, Busan Paik Hospital, Inje University, Busan, Korea.
9. Department of Cardiovascular Medicine, St. Vincent's Hospital, The Catholic University of Korea, Daejeon, Korea.
10. Department of Cardiovascular Medicine, Gil Medical Center, Gachon University, Incheon, Korea.
11. Department of Cardiovascular Medicine, Gangnam Severance Hospital, Yonsei University, Seoul, Korea.
12. The Heart Center, Chonnam National University Hospital, Gwangju, Korea.
13. Department of Cardiovascular Medicine, Guro Hospital, Korea University, Seoul, Korea.
14. Department of Cardiovascular Medicine, Samsung Medical Center, Sungkyunkwan University, Seoul, Korea.
15. Division of Cardiology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
16. Division of Cardiology, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.