1. Division of Cardiology, Department of Internal Medicine, Seoul St. Mary’s Hospital, Catholic Research Institute for Intractable Cardiovascular Disease, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Division of Cardiology, Department of Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Cardiovascular Medicine, Chonnam National University Medical School, Gwangju, Korea.
4. Division of Cardiology, Department of Internal Medicine, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
5. Department of Cardiology, Nowon Eulji Medical Center, Eulji University, Seoul, Korea.
6. Division of Cardiology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
7. Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.
8. Division of Cardiology, Department of Internal Medicine, Gil Medical Center, Gachon University College of Medicine, Incheon, Korea.
9. Division of Cardiology, Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
10. Division of Cardiology, Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.