1. Cardiovascular Center of Chungbuk National University Hospital, Cheongju, Korea.
2. Division of Medicine/Cardiology, Cheil General Hospital, Kwandong University, College of Medicine, Seoul, Korea.
3. Cardiovascular Center, Korea University Guro Hospital, Seoul, Korea.
4. Cardiovascular Center and Cardiology Division, College of Medicine, The Catholic University of Korea, Seoul, Korea.
5. Cardiovascular Center, Seoul National University Bundang Hospital, Seongnam, Korea.
6. The Heart Center of Chonnam National University Hospital, Gwangju, Korea.
7. Department of Cardiology, Ajou University School of Medicine, Suwon, Korea.
8. Division of Cardiology, Department of Internal Medicine, Yonsei University College Medicine, Seoul, Korea.
9. Department of Cardiology, Heart Center, College of Medicine, Konyang University, Daejeon, Korea.