Affiliation: | 1. Department of Cardiovascular Surgery, KKR Sapporo Medical Center, Hiragishi 1-6, Toyohira-ku, Sapporo, Hokkaido, 062-0931, Japan 2. Division of Cardiovascular Surgery, Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan 3. Department of Cardiovascular Surgery, Kinan General Hospital, Tanabe, Wakayama, Japan
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