1. Department of Cardiology, Konkuk University School of Medicine, Chungju, Korea.
2. Division of Cardiology, Department of Internal Medicine, Keimyung University Dongsan Hospital, Daegu, Korea.
3. Division of Cardiology, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul, Korea.
4. Department of Cardiology, Pusan National University Yangsan Hospital, Busan, Korea.
5. Department of Cardiology, The Catholic University of Korea, Incheon St. Mary's Hospital, Incheon, Korea.
6. Department of Internal Medicine, Chungbuk National University College of Medicine, Cheongju, Korea.
7. Division of Cardiology, Department of Internal Medicine, Seoul National University College of Medicine, Seoul Metropolitan Government-Seoul National University Boramae Medical center, Seoul, Korea.
8. Division of Cardiology, The Catholic University of Korea, St.Vincent's Hospital, Suwon, Korea.
9. Division of Cardiology, Department of Internal Medicine, Kangwon National University School of Medicine, Kangwon National University Hospital, Chuncheon, Korea.
10. Division of Cardiology, University of Inje College of Medicine, Inje University Heaundae Paik Hospital, Busan, Korea.
11. Division of Cardiology, University of Inje College of Medicine, Busan Paik Hospital, Busan, Korea.