^○Kentaro Kiryu, Takayuki Kadohama, Genbu Yamaura, Fuminobu Tanaka, Daichi Takagi, Toshinori Itagaki, Takeshi Arai, Kensuke Okuguti, Hiroshi Yamamoto (Akita University School of Medicine)

^○Tae Mizunaga, Keita Yano, Yuko Kawamura, Sawaka Tanabe, Atsushi Takamori, Narihisa Yamada, Koichi Morioka, Takaaki Koshiji (Department of Cardiovascular Surgery,Fukui University, Fukui, Japan)

^○Hirohito Ishii, Eisaku Nakamura, Koji Furukawa, Yukie Shirasaki, Nobuhiko Ichiki, Kazuhiro Higuchi, Kunihide Nakamura (University of Miyazaki, Department of Surgery, Division of Cardiovascular surgery, Miyazaki, Japan)

^○Yasuka Nakanishi, Kentaro Honda, Mitsuru Yuzaki, Masahiro Kaneko, Ryosuke Funahashi, Takahiro Fujimoto, Kouta Agematsu, Mizuki Nagashima, Yoshiharu Nishimura (Department of thoracic and cardiovascular surgery,wakayama medical university, Wakayama,Japan)

^○Tomonori Koga, Takashi Oshitomi, Ichiro Ideta, Kentaro Takaji, Yukihiro Katayama, Toshiharu Sassa, Hidetaka Murata, Shizuya Shintomi, Hideyuki Uesugi (Saiseikai Kumamoto Hospital, Kumamoto, Japan)

^○Daisuke Kaneyuki, Toshihisa Asakura, Atsushi Iguchi, Akihiro Yoshitake, Chiho Tokunaga, Masato Tochii, Jun Hayashi, Akitoshi Takazawa, HIroaki Izumida, Hiroyuki Nakajima (Saitama Medical University International Medical Center, Saitama, Japan)