1. Tissue Engineering Research Center, AIST Kansai, Amagasaki Site, National Institute of Advanced Industrial Science and Technology, 3‐11‐46 Nakoji, Amagasaki, Hyogo 661‐0974, Japan
2. Department of Orthopedics, Institute of Clinical Medicine, University of Tsukuba, Tsukuba, Japan
3. Biomedical Engineering Laboratory, Graduate School of Engineering, University of Tokyo, Tokyo, Japan
4. Institute for Human Science and Biomedical Engineering, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan