Kazuki Kano1, Takanobu Yamada1, Takashi Ogata1, Takashi Oshima2. 1. Department of Gastrointestinal Surgery, Kanagawa Cancer Center, Yokohama, Kanagawa, Japan. 2. Department of Gastrointestinal Surgery, Kanagawa Cancer Center, Yokohama, Kanagawa, Japan. oshimat@kcch.jp.