1. Department of Gastrointestinal Surgery, Kanagawa Cancer Center, Yokohama, Kanagawa 241‑8515, Japan
2. Department of Surgery, Yokohama City University, Yokohama, Kanagawa 236‑0004, Japan
3. Department of Gastric Surgery, Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo 113‑8677, Japan
4. Department of Gastric Surgery, National Cancer Center Hospital, Tokyo 104‑0045, Japan