1. Department of Oncology Center Yamaguchi University Hospital Yamaguchi Japan
2. Department of Cancer Survey and Gastrointestinal Oncology Osaka International Cancer Institute Osaka Japan
3. Department of Medical Oncology Kyoto University Hospital Kyoto Japan
4. Department of Gastroenterological Surgery Osaka University Graduate School of Medicine Osaka Japan
5. Department of Frontier Science for Cancer and Chemotherapy Osaka University Osaka Japan
6. Department of Gastroenterological Surgery Graduate School of Medicine, Osaka University Osaka Japan
7. Department of Gastroenterological Surgery Graduate School of Medical Science, Kumamoto University Kumamoto Japan
8. Department of Surgery Graduate School of Medicine, Kyoto University Kyoto Japan
9. Department of Gastroenterological Surgery I Hokkaido University Graduate School of Medicine Hokkaido Japan
10. Department of Digestive Surgery Nihon University School of Medicine Tokyo Japan
11. Second Department of Surgery, School of Medicine Wakayama Medical University Wakayama Japan
12. Department of Medical Oncology Tohoku University Hospital Sendai Japan
13. Department of Surgery Nara Medical University Nara Japan
14. Department of Surgery Kindai University Faculty of Medicine Osaka Japan
15. Department of Gastroenterological Surgery Hyogo College of Medicine Hyogo Japan
16. Department of Medical Oncology/Hematology Kobe University Hospital and Graduate School of Medicine Hyogo Japan
17. Department of Surgery Toyonaka Municipal Hospital Osaka Japan
18. Division of Gastroenterology and Hematology/Oncology Department of Medicine, Asahikawa Medical University Hokkaido Japan
19. Department of Gastroenterological, Breast and Endocrine Surgery Yamaguchi University Graduate School of Medicine Yamaguchi Japan
20. Medical Center for Clinical and Translational Research Hiroshima University Hospital Hiroshima Japan