1 Department of Cardiovascular Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
2 Department of Immunology and Molecular Medicine, Osaka University Graduate School of Medicine, Suita, Osaka, Japan.
3 Department of Cardiovascular Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan. sawa-p@surg1.med.osaka-u.ac.jp.