1. Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
2. Department of Biostatistics, College of Medicine, Catholic University of Korea, Seoul, Republic of Korea
3. Division of Cardiology, Department of Internal Medicine, Soonchunhyang University Hospital, Seoul, Republic of Korea
4. Division of Cardiology, Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea
5. Division of Cardiology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea