1 Gastric Surgery Division, National Cancer Center Hospital East, 5-1-1 Tsukiji, Chuo-ku, Tokyo, 104-0045, Japan; Division of Surgical Oncology, Department of Surgery, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8650, Japan.
2 Gastric Surgery Division, National Cancer Center Hospital East, 5-1-1 Tsukiji, Chuo-ku, Tokyo, 104-0045, Japan. Electronic address: takkinos@east.ncc.go.jp.
3 Gastric Surgery Division, National Cancer Center Hospital, 6-5-1 Kashiwanoha, Kashiwa, Chiba, 277-8577, Japan. Electronic address: smorita@ncc.go.jp.
4 Gastric Surgery Division, National Cancer Center Hospital, 6-5-1 Kashiwanoha, Kashiwa, Chiba, 277-8577, Japan.
5 Gastric Surgery Division, National Cancer Center Hospital East, 5-1-1 Tsukiji, Chuo-ku, Tokyo, 104-0045, Japan.