1. Department of Gastroenterology and Hepatology Hokkaido University Hospital Sapporo Japan
2. Division of Gastrointestinal Oncology Shizuoka Cancer Center Nagaizumi Japan
3. Department of Clinical Oncology St. Marianna University School of Medicine Kawasaki Japan
4. Department of Clinical Oncology Aichi Cancer Center Hospital Nagoya Japan
5. Department of Gastroenterology and Gastrointestinal Oncology National Cancer Center Hospital East Kashiwa Japan
6. Department of Gastrointestinal Surgery Kanagawa Cancer Center Yokohama Japan
7. Department of Gastrointestinal Medical Oncology National Hospital Organization Shikoku Cancer Center Matsuyama Japan
8. Department of Medical Oncology Kobe City Medical Center General Hospital Kobe Japan
9. Department of Surgery Kansai Rosai Hospital Amagasaki Japan
10. Department of Gastroenterology Saitama Cancer Center Ina Japan
11. Division of Gastroenterology Chiba Cancer Center Chiba Japan
12. Department of Gastrointestinal and Medical Oncology National Hospital Organization Kyushu Cancer Center Fukuoka Japan
13. Department of Medical Oncology Kindai University Faculty of Medicine Osaka‐sayama Japan
14. Cancer Treatment Center Kansai Medical University Hospital Hirakata
15. Department of Medical Oncology Kochi Medical School Nankoku Japan
16. Department of Gastrointestinal Medical Oncology National Cancer Center Hospital Tokyo Japan
17. Department of Gastroenterological Surgery and Pediatric Surgery Gifu University Hospital Gifu Japan
18. Department of Surgery National Hospital Organization Osaka National Hospital Osaka Japan
19. Institute of Health Science Innovation for Medical Care Hokkaido University Hospital Sapporo Japan
20. G&G Science Co., Ltd. Fukushima Japan
21. Department of Biostatistics and Bioinformatics, Graduate School of Medicine The University of Tokyo Tokyo Japan