Kazuki Kano1, Takanobu Yamada1, Takashi Oshima2. 1. Department of Gastrointestinal Surgery, Kanagawa Cancer Center, 2-3-2 Nakano, Asahi-ku, Yokohama, Kanagawa, 241-8515, Japan. 2. Department of Gastrointestinal Surgery, Kanagawa Cancer Center, 2-3-2 Nakano, Asahi-ku, Yokohama, Kanagawa, 241-8515, Japan. oshimat@kcch.jp.