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Osamu Izumiyama
Department of Cardiovascular Surgery, Hakodate Municipal Hospital
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Akio Yamashita
Department of Cardiovascular Surgery, Hakodate Municipal Hospital
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Satoru Sugimoto
Department of Cardiovascular Surgery, Hakodate Municipal Hospital
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Masahito Baba
Department of Cardiovascular Surgery, Hakodate Municipal Hospital
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Tadashi Hasegawa
Department of Cardiovascular Surgery, Hakodate Municipal Hospital