^○Kanji Matsuzaki^1,2, Yusuke Iguchi¹, Toru Tsukada¹, Yasunori Watanabe¹, Fujio Sato³, Tomoaki Jikuya³ (1.Hitachi General Hospital, Department of Cardiovascular Surgery, 2.University of Tsukuba Hospital, Hitachi Social Cooperation Education Research Center, 3.Tsukuba Medical Center Hospital, Department of Cardiovascular Surgery)

^○Koichi Maeda¹, Toru Kuratani¹, Kazuo Shimamura¹, Isamu Mizote², Yasuhiro Ichibori², Toshinari Onishi², Masaki Tsuda², Takashi Mukai², Takayoshi Ueno¹, Toichi Toda¹, Yasushi Sakata², Yoshiki Sawa¹ (1.Department of Cardiovascular Surgery, Osaka University Graduate School of Medicine, 2.Department of Cardiology, Osaka University Graduate School of Medicine)

^○Hidenori Yoshitaka, Genta Chikazawa, Nobuo Kondou, Arudo Hiraoka, Toshinori Totsugawa, Kentarou Tamra, Satoru Kishimoto, Akihiro Sasahara, Hitoshi Tachibana, Kousuke Sakamoto, Kouichi Inoue, Kenji Tanaka, Kazuhumi Suzuki, Taichi Sakaguchi (The Sakakibara Heart Institute of Okayama)

^○Takuma Yamasaki, Satsuki Fukushima, Yusuke Shimahara, Yorihiko Matsumoto, Kizuku Yamashita, Naonori Kawamoto, Junjiro Kobayashi, Tomoyuki Fujita (National Cerebral and Cardiovascular Center)

^○Shuichi Naraoka, Kazutoshi Tachibana (Hakodate Goryoukaku Hospital Hakodate Japan)

^○Chikao Teramoto, Hiroshi Okamoto, Akinori Tamenishi, Yasuyuki Fujimoto (Departmaent of Cardiac Surgery, Yokkaichi Municipal Hospital, Yokkaichi-shi, Mie, Japan)