1. Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea.
2. Division of Cardiology, Yeungnam University Hospital, Daegu, Korea.
3. Division of Cardiology, Kyungpuk National University Hospital, Daegu, Korea.
4. Department of Cardiology, Pusan National University Hospital, Busan, Korea.
5. Department of Cardiology, Chungnam National University Hospital, Daejon, Korea.
6. Department of Cardiology, Chunbuk National University Hospital, Jeonju, Korea.
7. Department of Cardiovascular Medicine, Kyung Hee University Hospital, Seoul, Korea.
8. Department of Cardiology, Chungbuk National University Hospital, Cheongju, Korea.
9. Division of Cardiology, Catholic University of Korea Seoul St. Mary's Hospital, Seoul, Korea.
10. Department of Cardiology, Asan Medical Center, University of Ulsan, Seoul, Korea.