1. Department of Surgery, Yonsei University College of Medicine, Gangnam Severance Hospital, Seoul, Korea.
2. Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.
3. Department of Surgery, Chonnam National University Medical School, Gwangju, Korea.
4. Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Department of Surgery, Yonsei University College of Medicine, Seoul, Korea.
6. Department of Surgery, Korea Cancer Center Hospital, Korea Institute of Radiological & Medical Sciences, Seoul, Korea.
7. Department of Surgery, Dong-A University College of Medicine, Busan, Korea.
8. Department of Surgery, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea.
9. Department of Surgery, Yeung-Nam University College of Medicine, Daegu, Korea.
10. Department of Surgery, Center for Liver Cancer, National Cancer Center, Goyang, Korea.
11. Department of Surgery, Ansan Hospital, Korea University College of Medicine, Ansan, Korea.
12. Department of Surgery, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Korea.
13. Department of Surgery, Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea.
14. Department of Surgery, Chonbuk National University Hospital and Medical School, Jeonju, Korea.
15. Department of Surgery, Eulji University College of Medicine, Daejeon, Korea.
16. Department of Surgery, Ewha Womans University Mokdong Hospital, Ewha Womans University School of Medicine, Seoul, Korea.
17. Department of Surgery, Gyeongsang National University Hospital, Gyeongnam Regional Cancer Center, Institue of Health Sciences, Gyeongsang National University, Jinju, Korea.
18. Department of Surgery, Konyang University Hospital, Konyang University College of Medicine, Daejeon, Korea.
19. Department of Surgery, Soonchunhyang University College of Medicine, Seoul, Korea.