1. Department of Cardiology Ewha Womans University College of Medicine Seoul Hospital Seoul Korea
2. Division of Cardiology Department of Internal Medicine Severance Cardiovascular Hospital Yonsei University College of Medicine Seoul Korea
3. Division of Cardiology Department of Internal Medicine Wonju Severance Christian Hospital Yonsei University Wonju College of Medicine Wonju Korea
4. Division of Cardiovascular Medicine Department of Internal Medicine Dankook University HospitalDankook University College of Medicine Cheonan Korea
5. Division of Cardiology Yongin Severance HospitalYonsei University College of Medicine Gyeonggi‐do Korea
6. Division of Cardiology National Health Insurance Service Ilsan Hospital Goyang Korea
7. Department of Cardiology CHA Bundang Medical Center CHA University Seongnam Korea
8. Cardiovascular & Arrhythmia Center Chung‐Ang University HospitalChung‐Ang University College of Medicine Seoul Korea
9. Department of Cardiology Myongji HospitalHanyang University College of Medicine Goyang Korea
10. Division of Cardiology Kangnam Sacred Heart Hospital Hallym University Medical Center Seoul South Korea
11. Division of Cardiology Gangnam Severance HospitalYonsei University College of Medicine Seoul South Korea