Affiliation: | 1. Department of Cardiovascular Surgery, Sakurabashi Watanabe Hospital, 2-4-32 Umeda, Kita-ku, Osaka, 530-0001, Japan 2. Department of Cardiovascular Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan 3. Department of Cardiovascular Surgery, Tokyo Women’s Medical University, Shinjuku-ku, Tokyo, Japan
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