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           This work was supported by the grant from the Guangdong   Bioactive Bone Graft. Biomaterials, 263:120378.
           Basic  and  Applied  Basic  Research  Foundation        https://doi.org/10.1016/j.biomaterials.2020.120378
           (2020B1515130002).
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           Conflict of interest                                    Hydrogels for the Delivery of Therapeutic Agents: A Review.
           The authors declare that they have no conflict of interest.  Eur Polym J, 72:602–619.
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