1. Department of Gastroenterological Surgery, Cancer Institute Hospital, Japanese Foundation for Cancer Research, Tokyo 135‑8550, Japan
2. Department of General and Gastroenterological Surgery, Osaka Medical College, Osaka 569‑8686, Japan
3. Department of Gastroenterological Surgery, Osaka City University Graduate School of Medicine, Osaka 558‑8585, Japan
4. Department of Digestive Surgery, Niigata Cancer Center Hospital, Niigata 951‑8566, Japan
5. Department of Gastric Surgery, Shizuoka Cancer Center, Sunto, Shizuoka 411‑8777, Japan
6. Department of Surgery, Okayama Saiseikai General Hospital, Kita-ku, Okayama 700‑8511, Japan
7. Department of Surgery, Yamagata Prefectural Central Hospital, Yamagata 990‑2214, Japan
8. Department of Gastric Surgery, Tokyo Metropolitan Cancer and Infectious Disease Center, Komagome Hospital, Tokyo 113‑8677, Japan
9. Department of Surgery, Yokohama Municipal Citizen's Hospital, Yokohama, Kanagawa 221‑0855, Japan
10. Division of Digestive Surgery, Department of Surgery, Kyoto Prefectural University of Medicine, Kamigyo-ku, Kyoto 602‑8566, Japan
11. Department of Surgical Oncology, Kanazawa Medical University, Uchinada, Ishikawa 920‑0293, Japan