1. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine
2. Division of Cardiology, Gangnam Severance Hospital, Yonsei University College of Medicine
3. Division of Cardiology, Chungnam National University Hospital
4. Division of Cardiology, Seoul National University Bundang Hospital
5. Division of Cardiology, Korea University Anam Hospital
6. Division of Cardiology, Asan Medical Center, College of Medicine, University of Ulsan
7. Division of Cardiology, Chonbuk National University Hospital
8. Division of Cardiology, Samsung Medical Center, Sungkyunkwan University School of Medicine
9. Division of Cardiology, Seoul St. Mary’s Hospital, the Catholic University of Korea