1. Department of Finemechanics, Graduate School of Engineering, Tohoku University, Sendai, Japan
2. Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo, Japan
3. Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, USA
4. Division of Clinical Cell Therapy, United Centers for Advanced Research and Translational Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan