1. Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea.
2. Department of Thoracic and Cardiovascular Surgery, Chonnam National University Hospital, Gwangju, Korea.
3. Department of Cardiovascular Medicine, Yeungnam University Hospital, Daegu, Korea.
4. Department of Cardiovascular Medicine, Kyungpook National University Hospital, Daegu, Korea.
5. Department of Cardiovascular Medicine, Department of Cardiovascular Medicine, Pusan National University Hospital, Pusan, Korea.
6. Department of Cardiovascular Medicine, Chungnam National University Hospital, Daejon, Korea.
7. Department of Cardiovascular Medicine, Chunbuk National University Hospital, Jeonju, Korea.
8. Department of Cardiovascular Medicine, KyungHee University Hospital, Seoul, Korea.
9. Department of Cardiovascular Medicine, Chungbuk National University Hospital, Cheongju, Korea.
10. Department of Cardiovascular Medicine, The Catholic University of Korea St Mary's Hospital, Seoul, Korea.
11. Department of Cardiovascular Medicine, Seoul National University, Seoul, Korea.