1. Department of Thoracic and Cardiovascular Surgery, Seoul, Korea
2. Department of Clinical Epidemiology and Biostatistics, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
3. Department of Thoracic and Cardiovascular Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
4. Department of Thoracic and Cardiovascular Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
5. Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
6. Department of Cardiovascular Surgery, Sejong General Hospital, Bucheon, Korea
7. Department of Thoracic and Cardiovascular Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
8. Department of Thoracic and Cardiovascular Surgery, Pusan National University Yangsan Hospital, Yangsan, Korea
9. Department of Thoracic and Cardiovascular Surgery, Wonju Severance Christian Hospital, Wonju, Korea
10. National Evidence-based Healthcare Collaborating Agency, Seoul, Korea
11. Department of Thoracic and Cardiovascular Surgery, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea