1. Division of Cardiology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine
2. Chonnam National University Hospital
3. Chungnam National University Hospital
4. Seoul National University Hospital
5. Korea University Guro Hospital
6. National Health Insurance Corporation Ilsan Hospital
7. Wonju Christian Hospital
8. Ajou Univeristy Hospital
9. Catholic University Seoul St. Mary's Hospital
10. Yonsei University Severance Hospital
11. Ulsan University Asan Medical Center