^○Takeshi Aoki, Masahiko Murakami, Akira Fujimori, Tomotake Koizumi, Tomokazu Kusano, Kosuke Yamada, Tomoki Hakozaki, Yoshihiko Tashiro, Kodai Tomioka, Tetsu Goto, Kuniyasu Yamazaki, Makoto Watanabe, Yuta Enami, Hideki Shibata, Kazuhiro Matsuda, Takahito Hirai, Keitaro Mitamura, Reiko Koike, Osamu Yoshitake, Koji Otsuka (Department of Gastroenterological & General Surgery, School of Medicine, Showa University)

^○Shintaro Kuroda, Tsuyoshi Kobayashi, Michinori Hamaoka, Masahiro Ohira, Hiroyuki Tahara, Seiichi Shimizu, Sho Okimito, Naruhiko Honmyo, Megumi Yamaguchi, Hiroaki Mashima, Hideki Ohdan (Department of Gastroenterological and Transplant Surgery, Hiroshima University, Hiroshima, Japan)

^○Satoru Seo, Rei Toda, Hiroaki Fuji, Ken Fukumitsu, Takamichi Ishii, Kojiro Taura, Hideaki Okajima, Toshimi Kaido, Shinji Uemoto (Department of Surgery Graduate School of Medicine Kyoto University)

^○Hiroyoshi Matsukawa, Daisuke Satoh, Kento Mishima, Shigehiro Shiozaki (Department of Surgery, Hiroshima City Hiroshima Citizens Hospital)

^○Takashi Kaizu, Yusuke Kumamoto, Hiroshi Tajima, Shigenori Ei, Nobuyuki Nishizawa, Masahiko Watanabe (Department of Surgery, Kitasato University Hospital, Kanagawa, Japan)

^○Takao Ide, Taketo Matsunaga, Tomokazu Tanaka, Hironori Iwasaki, Hirokazu Noshiro (Department of Surgery, Saga University Faculty of Medicine)