^○Masayoshi Obatake, Shinichiro Yamada, Masahiko Fujii, Hiromi Ohtani, Masamitsu Harada, Hideki Kawasaki (Department of Gastroenterological Surgery, Ehime Prefectural Central Hospital, Ehime)

^○Yusuke Katsuki, Yoshihiko Sakurai, Katsuhiko Arai (Department ob Surgery, Shonan Tobu Medical Hospital, Chigasaki, Japan)

^○Yukinori Toyoshima, syunnichi Ariizumi, Satoshi Nemoto, Takaaki Kato, shining Yamashita, Akin Omari, Yoshihito Kodea, Hiroto Egawa, Masakazu Yamamoto (Department of Surgery, Institute of Gastroenterology, Tokyo Women's Medical University, Tokyo, Japan)

^○Miku Obayashi, Atsushi Maema, Ren Nishizu, Masaki Azuma (Department of Surgery, Fujieda Municipal General Hospital)

^○Kazutaka Kimura, Yoshihisa Kubota, Sho Yoshino, Yuko Ito, Yu Mathumoto, Tethuya Maeda, Toshio Katagiri, Yuichirou Otuka, Hideaki Shimada, Hironori Kaneko, Kimihiko Funahashi (Department of Surgery, Toho University, Tokyo, Japan)

^○Kiyoshi Yoshikawa, Kazuhiro Yamada (Department of Digestive Surgery, Suita Tokushukai Hospital, Osaka, Japan)