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

^○Takamichi Ishii, Takayuki Kawai, Kota Iguchi, Ken Fukumitsu, Satoru Seo, Kojiro Taura, Hideaki Okajima, Toshimi Kaido, Shinji Uemoto (Department of Surgery, Kyoto University, Kyoto, Japan)

^○Akira Mori, Yoshihisa Umemoto, Yusuke Fujii, Yuki Mochida, Akio Nakajima, Akira Arimoto (Department of Surgery, Osaka Red Cross Hospital, Osaka, Japan)