1. Department of Cardiology, Cardiovascular Center, Korea University Anam Hospital, Korea University College of Medicine, Seoul, South Korea
2. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, South Korea
3. Division of Cardiology, Department of Internal Medicine, Soonchunhyang University Cheonan Hospital, Cheonan, South Korea
4. Department of Cardiology, Yonsei University Wonju Severance Christian Hospital, Wonju, South Korea
5. Division of Cardiology, Department of Internal Medicine, Kangwon National University School of Medicine, Chuncheon, South Korea
6. Department of Internal Medicine, Hanyang University Myongji Hospital, Goyang, South Korea
7. Department of Cardiology, Gachon University Gil Medical Center, Incheon, South Korea
8. Department of Internal Medicine, Division of Cardiology, Kyung Hee University Hospital, Kyung Hee University School of Medicine, Seoul, South Korea
9. Division of Cardiology, Department of Internal Medicine, Hanyang University College of Medicine, Seoul, South Korea
10. Division of Cardiology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea