1. Division of Cardiovascular Surgery, Tohoku University Graduate School of Medicine, Seiryocho, Aoba-ku, Sendai, Japan
2. Micro System Integration Center, Tohoku University, Miyagi, Aoba, Aramaki Aoba-ku, Sendai, Japan
3. Tohoku University Graduate School of Biomedical Engineering, Aoba, Aramaki Aoba-ku, Sendai, Japan