1. Department of Surgery, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Surgery, Korea Institute of Radiology and Medical Science, Seoul, Korea.
4. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
5. Department of Surgery, Ajou University School of Medicine, Suwon, Korea.
6. Department of Surgery, Hallym University Sacred Heart Hospital, Anyang, Korea.
7. Department of Radiation Oncology, Sungkyunkwan University School of Medicine, Seoul, Korea.
8. Department of Surgery, St. Vincent's Hospital, The Catholic University of Korea School of Medicine, Suwon, Korea.
9. Department of Surgery, Sungkyunkwan University School of Medicine, Seoul, Korea.
10. Department of Surgery, Soonchunhyang University Hospital, Seoul, Korea.
11. Department of Surgery, Ewha Womans University Medical Center, Seoul, Korea.
12. Department of Preventive Medicine, Seoul National University College of Medicine · Cancer Research Institute, Seoul National University · Department of Biomedical Science, Seoul National University College of Medicine, Seoul, Korea.