1. Department of Surgery, Chungbuk National University Hospital, College of Medicine, Chungbuk National University, Cheongju, Korea.
2. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
4. Department of Surgery, Kosin University Gospel Hospital, Busan, Korea.
5. Department of Surgery, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
6. Department of Surgery, National Cancer Center, Goyang, Korea.
7. Department of Surgery, Soonchunhyang University Seoul Hospital, Seoul, Korea.
8. Department of Surgery, Samsung Seoul Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
9. Department of Surgery, Korea University Anam Hospital, Seoul, Korea.
10. Department of Surgery, Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, Korea.
11. Department of Surgery, Research Institute of Clinical Medicine of Jeonbuk National University, Biomedical Research Institute of Jeonbuk National University Hospital, Jeonju, Korea.