1. Division of Cardiology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine
2. Samsung Changwon Hospital, Sungkyunkwan University School of Medicine
3. Chonnam National University Hospital
4. Seoul National University Hospital
5. Chungnam National University Hospital
6. Korea University Anam Hospital
7. Korea University Guro Hospital
8. Yonsei University Severance Hospital
9. Wonju Christian Hospital
10. Ajou University Hospital
11. Catholic University Kangnam St. Mary’s Hospital
12. and Yeungnam University Hospital