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Surface morphologies of: (a) brushite-coated, (b) hydroxyapatite-coated, and (c) fluoridated-hydroxyapatite-coated Mg–Zn alloy substrates. (d) Cross-sectional view of the fluoridated-hydroxyapatite-coated specimen. Obtained from [84], with permission from Acta Biomaterialia, Elsevier, 2018.
