1. Division of Cardiology, Department of Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Division of Cardiology, Department of Internal Medicine, Chungnam National University Hospital, Chungnam National University College of Medicine, Daejeon, Korea.
3. Division of Cardiology, Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Division of Cardiology, Department of Internal Medicine, Bucheon Sejong Hospital, Bucheon, Korea.
5. Division of Cardiology, Department of Internal Medicine, Jeonbuk National University Hospital and Jeonbuk National University Medical School, Jeonju, Korea.
6. Division of Cardiology, Department of Internal Medicine, Keimyung University Dongsan Hospital, Daegu, Korea.
7. Division of Cardiology, Department of Internal Medicine, Chungbuk National University, Cheongju, Korea.
8. Division of Cardiology, Department of Internal Medicine, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.
9. Department of Cardiology, Pusan National University Yangsan Hospital, Yangsan, Korea.
10. Division of Cardiology, Department of Internal Medicine, Konkuk University Medical Center, Konkuk University School of Medicine, Seoul, Korea.
11. Division of Cardiology, Department of Internal Medicine, Kangwon National University Hospital, Kangwon National University College of Medicine, Chuncheon, Korea.
12. Division of Cardiovascular Medicine, Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA, USA.
13. Division of Cardiology, Department of Internal Medicine, Chonnam National University Hospital, Gwangju, Korea.
14. Department of Internal Medicine and Cardiovascular Center, Seoul National University Hospital, Seoul, Korea.
15. Department of Internal Medicine and Cardiovascular Center, Chosun University Hospital, University of Chosun College of Medicine, Gwangju, Korea.
16. Division of Cardiology, Department of Internal Medicine, Gangneung Asan Hospital, University of Ulsan College of Medicine, Gangneung, Korea.
17. Department of Cardiology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
18. Department of Cardiology, Inje University Ilsan Paik Hospital, Goyang, Korea.