1. Heart Vascular and Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
3. Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.
4. Division of Cardiology, Busan Paik Hospital, University of Inje College of Medicine, Busan, Korea.
5. Division of Cardiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
7. Division of Cardiology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea.
8. Division of Cardiology, Heart Center of Chonnam National University Hospital, Gwangju, Korea.
9. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.
10. Division of Cardiology, Keimyung University Dongsan Medical Center, Daegu, Korea.
11. Division of Cardiology, Sanggye-Paik Hospital, University of Inje College of Medicine, Seoul, Korea.
12. Department of Internal Medicine, Kangdong Sacred Heart Hospital, Hallym University Medical Center, Seoul, Korea.