1. Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, Ube, Yamaguchi 755‑8505, Japan
2. Department of Medical Oncology, Kyoto University Hospital, Kyoto 606‑8501, Japan
3. Department of Gastroenterological Surgery, Osaka University Graduate School of Medicine, Suita, Osaka 565‑0871, Japan
4. Department of Gastroenterological Surgery, Osaka International Cancer Institute, Suita, Osaka 565‑0871, Japan
5. Department of Frontier Science for Cancer and Chemotherapy, Osaka University, Suita, Osaka 565‑0871, Japan
6. Department of Gastroenterological Surgery, Graduate School of Medical Science, Kumamoto University, Kumamoto 860‑8556, Japan
7. Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060‑8648, Japan
8. Department of Digestive Surgery, Nihon University School of Medicine, Tokyo 173‑8610, Japan
9. Second Department of Surgery, School of Medicine, Wakayama Medical University, Wakayama 641‑8509, Japan
10. Department of Medical Oncology, Tohoku University Hospital, Sendai, Miyagi 980‑8574, Japan
11. Medical Center for Clinical and Translational Research, Hiroshima University Hospital, Hiroshima 734‑8551, Japan
12. Department of Surgery, Graduate School of Medicine, Kyoto University, Kyoto 606‑8501, Japan
13. Department of Oncology Center, Yamaguchi University Hospital, Ube, Yamaguchi 755‑8505, Japan