1. Division of Cardiology, Department of Internal Medicine, Kangwon National University College of Medicine, Kangwon National University School of Medicine, Chuncheon, Korea.
2. Cardiovascular Center, Korea University Guro Hospital, Seoul, Korea.
3. Department of Biomedical Laboratory Science, Honam University, Gwangju, Korea.
4. Cardiology Division, Department of Internal Medicine, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
5. Department of Cardiology, Changwon Hanmaeum Hospital, Hanyang University College of Medicine, Changwon, Korea.
6. Division of Cardiology, Department of Internal Medicine, Cardiovascular Center, Nowon Eulji Medical Center, Eulji University, Seoul, Korea.
7. Cardiology Department, Soonchunhyang University Cheonan Hospital, Cheonan, Korea.
8. Cardiovascular Center, Gwangju Veterans Hospital, Chonnam National University Hospital, Gwangju, Korea.