1. Division of Cardiology, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
2. Department of Internal Medicine and Medial Research Institute, Pusan National University Hospital, Pusan National University School of Medicine, Busan, Republic of Korea
3. Department of Cardiology, Sahmyook Medical Center, Seoul, Republic of Korea
4. Department of Cardiology, Korea University Guro Hospital, Seoul, Republic of Korea
5. Division of Cardiology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
6. Department of Cardiology, Dong-A University Medical Center, Busan, Republic of Korea
7. Department of Cardiology, Boramae Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
8. Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
9. Division of Cardiology, Department of Internal Medicine, Korea University Medicine, Anam Hospital, Seoul, Republic of Korea
10. Department of Cardiology, Kyung Hee University Hospital at Gangdong, Seoul, Republic of Korea
11. Department of Cardiology, Hallym University Dongtan Sacred Heart Hospital, Gyeonggi-do, Republic of Korea
12. Department of Internal Medicine, Seoul National University, Bundang Hospital, Gyeonggi-do, Republic of Korea