Affiliation: | 1. Department of Cardiovascular Surgery, Chiba Kaihin Municipal Hospital, 3-31-1, Isobe, Mihama-ku, Chiba, Chiba, 261-0012, Japan 2. Department of Cardiovascular Surgery, Chiba University Graduate School of Medicine, Chiba, Japan 3. Department of Cardiovascular Surgery, Chiba Nishi General Hospital, Chiba, Japan
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