^○Koichi Shinoto (Department of Surgery, Yokohama Rosai Hospital, Kanagawa, Japan)

^○Yusuke Nakayama, Eiji Toyoda, Yusuke Abe, Akihiro Kaneda, Naoto Nakamura, Takashi Ito, Jun Matsubayashi, Kazuhiko Kitaguchi, Katsuaki Ura, Hideaki Oe, Tetsuro Hirose, Ryuichiro Doi (Department of Surgery, Otsu Red Cross Hospital, Shiga, Japan)

^○Takahiko Hyo, Manabu Kawai, Seiko Hirono, Ken-ichi Okada, Motoki MIyazawa, Yuji Kitahata, Masaki Ueno, Shinya Hayami, Ryohei Kobayasi, Atsushi Miyamoto, Norihiko Suzaki, Hiroki Yamaue (Second department of Surgery, Wakayama medical university,Wakayama, Japan)

^○Masaru Sasaki, Atsushi Nakamitsu, Mohei Kohyama, Tatsuya Tazaki, Yoichi Sugiyama, Shinnosuke Uegami, Ryuta Shintakuya, Yasuko Kameda, Sho Tazuma, Kensuke Shimbara, Kohei Miyashita (Department of Surgery, JA Hiroshima General Hospital, Hiroshima, Japan)

^○Kenji Umeda, Koichiro Tahara, Masahiro Kawamura, Sho Nanbara, Hiroyuki Kawano, Akira Kabashima, Hideaki Anai (Department of Surgery, Oita Medical Center, Oita, Japan)

^○Kunihiro Saga, Yukio Iwashita, Kazuhiro Tada, Teijiro Hirashita, Yuichi Endo, Hiroki Uchida, Masayuki Ohta, Masafumi Inomata (Department of Gastroenterological and Pediatric Surgery, Oita University Faculty of Medicine, Oita, Japan)