1. Department of Cardiology, Chonnam National University Hospital, Gwangju, Korea.
2. Department of Preventive Medicine, Chonnam National University Medical School, Hwasun, Korea.
3. Department of Cardiology, Chonnam National University Medical School, Hwasun, Korea.
4. Department of Cardiology, Kyungpook National University Hospital, Daegu, Korea.
5. Department of Cardiology, Chungnam National University Hospital, Daejeon, Korea.
6. Department of Cardiology, Yeungnam University Hospital, Daegu, Korea.
7. Department of Cardiology, Seoul National University Bundang Hospital, Seongnam, Korea.
8. Department of Cardiology, Keimyung University Dongsan Medical Center, Daegu, Korea.
9. Department of Cardiology, Jeonbuk National University Hospital, Jeonju, Korea.