1. Department of Medical Engineering and Cardiology, Institute of Development, Aging and Cancer, Tohoku University, Sendai,
2. Ebara Corporation, Fujisawa,
3. Graduate School of Engineering, Tohoku University,
4. Department of Thoracic and Cardiovascular Surgery, Tohoku University School of Medicine,
5. Graduate School of Information Sciences, Tohoku University,
6. Faculty of Engineering, Tohoku‐gakuin University, Sendai, Japan