Tatsunori Miyata1, Hiromitsu Hayashi1, Hideo Baba2. 1. Department of Gastroenterological Surgery, Graduate School of Life Sciences, Kumamoto University, Kumamoto, Japan. 2. Department of Gastroenterological Surgery, Graduate School of Life Sciences, Kumamoto University, Kumamoto, Japan. hdobaba@kumamoto-u.ac.jp.