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Itaru Hosaka
Department of Cardiovascular Surgery, Sapporo Medical University School of Medicine [Japan]
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Tsuyoshi Shibata
Department of Cardiovascular Surgery, Sapporo Medical University School of Medicine [Japan]
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Yutaka Iba
Department of Cardiovascular Surgery, Sapporo Medical University School of Medicine [Japan]
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Nobuyoshi Kawaharada
Department of Cardiovascular Surgery, Sapporo Medical University School of Medicine [Japan]