^○Hiroshi Ito¹, Manabu Sudo², Yoshitaka Ikeda¹, Takahiro Ikeshita¹, Kensuke Sakata¹ (1.Saiseikai Shimonoseki General Hospital, 2.Saiseikai Shimonoseki General Hospital)

^○Masao Takahashi¹, Keisuke Miyajima¹, Toshihiro Ishikawa², Kazuyoshi Hatada² (1.Department of Cardiovascular Surgery, Hiratsuka Kyosai Heart Center, Hiratsuka city, Kanagawa, Japan, 2.Department of Cardiovascular Surgery, Odawara Municipal Hospital, Odawaracity, Kanagawa, Japan)

^○Manabu Sato, Hiromitsu Kawasaki, Masahide Shitijo, Kozo Nitoh (Saga-Ken Medical Centre Koseikan)

^○Mamoru Arakawa, Homare Okamura, Atsushi Miyagawa, Hideo Adachi (Nerima Hikarigaoka Hospital)