Kazuki Kano1, Takanobu Yamada1, 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.