1. Department of Biomedical Engineering Graduate School of Biomedical Engineering Tohoku University 6‐6‐12 Aza‐Aoba, Aramaki, Aoba‐ku Sendai Miyagi Japan
2. Department of Mechanical Systems Engineering Graduate School of Engineering Tohoku University 6‐6‐12 Aza‐Aoba, Aramaki, Aoba‐ku Sendai Miyagi Japan