^○Sho Fujiwara, Koji Miyazawa, Nozomi Koyamada (Department of Surgery, Iwate Prefectural Chubu Hospital, Iwate, Japan)

^○Akinori Miyata, Takashi Ishida, Motoki Nagai, Yukihiro Nomura, Nobutaka Tanaka (Department of Surgery, Asahi General Hospital)

^○Tomotake Koizumi, Takeshi Aoki, Tomokazu Kusano, Akira Fujimori, Yuta Enami, koji Aogaki, Yoshihiko Tashiro, Tomoki Hakozaki, Kodai Tomioka, Reiko Koike, Keitaro Mitamura, Kazuhiro Matsuda, Kosuke Yamada, yusuke Wada, Hideki Shibata, Takahito Hirai, Masahiko Murakami (Department of Gastroenterological and General Surgery, Showa University)

^○Masaru Kanehira¹, Kyohei Abe¹, Yasuro Futagawa¹, Tomoyoshi Okamoto¹, Katsuhiko Yanaga² (1.Department of Surgery, The Jikei University Daisan Hospital, Tokyo, Japan, 2.Department of Surgery, The Jikei University School of Medicine, Tokyo, Japan)

^○Sherif Mohammed Elgarf, Safi Dokmak, Hamdy Sedky, Osama Elkhadrawy, Gamal Moussa, Ahmed Swelam, Antoni Sa Cunha, Rene Adam, Alain Sauvanet (Department of Surgery, Tanta University)

^○Katsutaka Mitachi, Masamichi Mizuma, Tatsuo Hata, Masahiro Iseki, Tatsuyuki Takadate, Kyohei Ariake, Kunihiro Masuda, Masaharu Ishida, Koji Fukase, Hideo Ohtsuka, Kei Nakagawa, Takanori Morikawa, Hiroki Hayashi, Fuyuhiko Motoi, Takeshi Naitoh, Michiaki Unno (Department of Surgery, Tohoku University Graduate School of Medicine, Japan)