1. Department of Gastroenterological Chemotherapy Cancer Institute Hospital of Japanese Foundation for Cancer Research Tokyo Japan
2. Department of Biomedical Statistics and Bioinformatics Kyoto University Kyoto Japan
3. Department of Medical Oncology Kagawa University Kita Japan
4. Department of Surgery Kansai Medical University Kouri Hospital Neyagawa Japan
5. Department of Gastroenterology Saitama Cancer Center Saitama Japan
6. Department of Clinical Oncology Kawasaki Medical School Kurashiki Japan
7. Cancer Treatment Center Kansai Medical University Hospital Osaka Japan
8. Department of Surgery National Hospital Organization Nagoya Medical Center Nagoya Japan
9. Gastrointestinal Cancer Center Sano Hospital Kobe Japan
10. Department of Surgery Kansai Rosai Hospital Amagasaki Japan
11. Comprehensive Cancer Center Aizawa Hospital Matsumoto Japan
12. Department of Surgery Osaka Saiseikai Senri Hospital Suita Japan
13. Department of Surgery Shikoku Central Hospital Shikokuchuo Japan
14. Department of Surgery Osaka Minato Central Hospital Osaka Japan
15. Department of Surgery Yamagata Prefectural Central Hospital Yamagata Japan
16. Department of Surgery Teikyo University School of Medicine Tokyo Japan
17. Department of Surgery Yokohama Municipal Citizen’s Hospital Yokohama Japan
18. Department of Advanced Medicine Nagoya University Hospital Nagoya Japan
19. Tokai Central Hospital Kakamigahara Japan