1. Division of Cardiology, Department of Internal Medicine, Korea University Guro Hospital, Korea University, Seoul, Korea.
2. Division of Cardiology, Department of Internal Medicine, Yonsei University, Wonju College of Medicine, Wonju, Korea.
3. Division of Cardiology, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Division of Cardiology, Department of Internal Medicine, Cardiovascular Center, Keimyung University Dongsan Hospital, Keimyung University School of Medicine, Daegu, Korea.
5. Department of Cardiovascular Medicine, Chonnam National University Medical School and Hospital, Gwangju, Korea.
6. Division of Cardiology, Department of Internal Medicine, Inje University Busan Paik Hospital, Inje University, Busan, Korea.
7. Division of Cardiology, Department of Internal Medicine, Chungnam National University Hospital, Chungnam National University School of Medicine, Daejeon, Korea.
8. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea.
9. Division of Cardiology, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
10. Division of Cardiology, Heart Institute, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
11. Division of Cardiology, Department of Internal Medicine, Jeonbuk National University Hospital, Jeonbuk National University Medical School, Jeonju, Korea.
12. Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.