^○Takanori Kyokane, Shingo Oya (Department of Surgery, Chutoen General Medical Center, Shizuoka, Japan)

^○Yoshihiro Mikuriya, Koji Ohta, Minoru Tanada (Department of Gastroenterological Surgery, Shikoku Cancer Center, Matsuyama, Japan)

^○Koji Kitada, Masaru Inagaki, Naoyuki Tokunaga, Yosuke Tsunemitsu, Hiromi Iwagaki (National Hospital organization Fukuyama medical center)

^○Mie Hamano, Satoshi Katagiri, Shunsuke Onizawa, Tatsuo Araida (Department of Hepato-Billiary-Pancreatic Surgery, Tokyo Women's Yachiyo Medical Center, Chiba, Japan)