1. Department of Mechanical and Aerospace Engineering, School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
2. Department of Materials Science and Engineering, School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
3. Frontier Research Institute for Interdisciplinary Sciences (FRIS), Tohoku University, Sendai, Miyagi 980-0845, Japan
4. Department of Finemechanics, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan
5. Department of Physiology, Graduate School of Medicine, Tohoku University, Sendai, Miyagi 980-8575, Japan
6. Institute of Materials, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
7. Graduate School of Biomedical Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan