1. Department of Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
2. Department of General Surgery, Nottingham University Hospitals, North Trent Deanery, Health Education England, Nottingham, United Kingdom.
3. Department of Surgery, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
4. Department of Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
5. Department of Surgery, Asan Medical Center, Ulsan University College of Medicine, Seoul, Korea.
6. Department of Surgery, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea.
7. Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
8. Department of Surgery, Samsung Medical Center, Sungkyunkwan University College of Medicine, Seoul, Korea.
9. Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
10. Department of Surgery, Keimyung University Dongsan Medical Center, Keimyung University College of Medicine, Daegu, Korea.
11. Cancer Research Institute, Seoul National University, Seoul, Korea.