1. Department of Regenerative Medicine and Stem Cell Biology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan.
2. Department of Orthopedic Surgery, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan.
3. Department of Cardiovascular Surgery, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan.
4. Department of Oral Surgery, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan.