1. Division of Cardiology, Department of Internal Medicine, Yonsei University Health System, Seoul, Korea.
2. Division of Cardiology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
3. Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.
4. Division of Cardiology, Department of Internal Medicine, CHA Bundang University Hospital, Seongnam, Korea.
5. Division of Cardiology, Department of Internal Medicine, Daegu Catholic University Hospital, Daegu, Korea.
6. Division of Cardiology, Department of Internal Medicine, Gangnam Severance Hospital, Seoul, Korea.
7. Division of Cardiology, Department of Internal Medicine, Inha University Hospital, Incheon, Korea.
8. Division of Cardiology, Department of Internal Medicine, Ewha Womans University Hospital, Seoul, Korea.