1. Division of Cardiology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
2. Department of Thoracic and Cardiovascular Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Thoracic Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
6. Division of Cardiology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
7. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
8. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.