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Declaration of competing interest
The authors declare that no conflict of interest exists.
Acknowledgments
We thank Dr. Peter Karagiannis for critically reading the
manuscript. This study was supported by a grant from the Network
Program for Realization of Regenerative Medicine from the Japan
Agency for Medical Research and Development (AMED).
Appendix A. Supplementary data
Supplementary data to this article can be found online at
https://doi.org/10.1016/j.reth.2022.01.002.
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