^○Eiichi Tanaka, Satoshi Hayama, Yosuke Mitsuhashi, Natsuko Ue, Satoru Matsumoto, Susumu Koshiko (Department of Surgery, IMS Sapporo Digestive Disease Hospital)

^○Hiromichi Ishii, Akinori Noguchi, Tomoyuki Fukami, Hiroyuki Tada, Hiroki Takeshita, Seiji Umehara, Naoki Tani, Tetsuro Yamane (Department of Surgery, Matsushita Memorial Hospital, Moriguchi, Japan)

^○Satoshi Yokoyama, Shinichi Hosokawa, Yoshikuni Yonenaga, Daisuke Ito, Masato Ichimiya, Kentaro Yasuchika (Department of Surgery, Wakayama Medical Center, Wakayama, Japan)

^○Yoshikazu Toyoki, Yutaro Hara, Shinnosuke Yonaiyama, Hiroyuki Jin, Makoto Nakai, Tomohisa Tokura, Kazunori Aoki, Hiroyuki Kawashima, Masaaki Endoh (Department of Surgery, Aomori City Hospital)

^○Satoshi Mizutani¹, Hideyuki Suzuki¹, Rina Ohyama¹, seiji Yamagishi¹, Masanori Watanabe¹, Yoshiharu Nakamura², Eiji Uchida² (1.Department of Gastrointestional Surgery, Nippon Medical School Musashikosugi Hospital, 2.Department of Surgery, Nippon Medical School)

^○Yumiko Kageyama, Ryuzo Yamaguchi, Shinya Watanabe, Keiji Aizu, Fumiya Sato, Atsuki Arimoto, Yasuhiro Mitake (Department of Surgery, Kasugai Municipal Hospital, Aichi, Japan)