1. Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea.
2. Department of Cardiology, Jeonbuk National University Hospital, Jeonju, Korea.
3. Department of Cardiology, Chosun University Hospital, Gwangju, Korea.
4. Department of Cardiology, Wonkwang University Hospital, Iksan, Korea.
5. Department of Cardiology, Jeju National University Hospital, Jeju, Korea.
6. Department of Cardiology, KS Hospital, Gwangju, Korea.
7. Department of Cardiology, Presbyterian Medical Center, Jeonju, Korea.
8. Department of Cardiology, St. Carollo General Hospital, Suncheon, Korea.
9. Department of Cardiology, Kwangju Christian Hospital, Gwangju, Korea.
10. Department of Cardiology, Cheomdan Medical Center, Gwangju, Korea.