^○Naoki Mori, Naoki Sakurai, Hajime Iizawa (Department of Surgery,Yamagata Prefectual Central Hospital,Yamagata,Japan)

^○Rumi Itoyama, Hirohisa Okabe, Yosuke Nakao, Toshihiko Yusa, Yuki Kitano, Kota Arima, Tatsunori Miyata, Shigeki Nakagawa, Hidetoshi Nitta, Katsunori Imai, Yoichi Yamashita, Akira Chikamoto, Hideo Baba (Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University)

^○Hiroyuki Takahashi, Toshiyasu Kawahara, Kouji Imai, Mikako Gouchi, Masahiro Hagiwara, Naoto Matsuno, Hiroyuki Furukawa (Division of Gastroenterologic Surgery, Department of Surgery, Asahikawa Medical University, Asahikawa, Hokkaido, Japan)

^○Koichi Kimura^1,2, Tomoharu Yoshizumi², Kensuke Kudo¹, Takashi Motomura², Yohei Mano², Takeo Toshima², Shinji Itoh², Noboru Harada², Toru Ikegami², Yuji Soejima², Yoshihiko Maehara², Tetsuo Ikeda¹ (1.Center of Endoscopy and Endoscopic Surgery, Fukuoka Dental College, Fukuoka, Japan, 2.Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan)

^○Kenichi Matsumoto, Takehiro Noda, Hidetoshi Eguchi, Yoshifumi Iwagami, Daisaku Yamada, Tadafumi Asaoka, Kunihito Gotoh, Koichi Kawamoto, Shogo Kobayashi, Koji Umeshita, Yuichiro Doki, Masaki Mori (Department of Gastroenterological Surgery, Graduate School of Medicine, Osaka University)

^○Teruhisa Sakamoto, Ei Uchinaka, Masaki Morimoto, Masataka Amisaki, Yosuke Arai, Naruo Tokuyasu, Soichiro Honjo, Yoshiyuki Fujiwara (Division of Surgical Oncology, Department of Surgery, School of Medicine, Tottori University Faculty of Medicine, Yonago, Japan)