1. Department of Surgery, Yonsei University College of Medicine, Seoul, South Korea
2. Department of Surgery, Ajou University School of Medicine, Suwon, South Korea
3. Biostatistics Collaboration Unit, Department of Biomedical Systems Informatics, Yonsei University College of Medicine, Seoul, South Korea
4. Department of Surgery and Cancer Research Institute, Seoul National University College of Medicine, Seoul, South Korea
5. Department of Surgery, Chonnam National University Medical School, Gwangju, South Korea
6. Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
7. Department of Surgery, Yeouido St Mary’s Hospital, The Catholic University of Korea, Seoul, South Korea
8. Department of Surgery, Seoul National University Bundang Hospital, Seoul, South Korea
9. Keimyung University Dongsan Medical Center, Daegu, South Korea
10. Department of Surgery, Dong-A University Hospital, Busan, South Korea
11. Department of Surgery, Incheon St Mary’s Hospital, The Catholic University of Korea, Incheon, South Korea
12. Center for Gastric Cancer, National Cancer Center, Goyang, Korea
13. Department of Surgery, Chung-Ang University Hospital, Seoul, South Korea
14. Department of Surgery, Nowon Eulji Medical Center, Eulji University, Seoul, South Korea