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Vancomycin release profiles of PLGA spheres and PLGA spheres coated with HAp nanoparticles (PLGA@HAp) (a) and their fits with the Hixson–Crowell (b), Higuchi (c), and Korsmeyer–Peppas (d) kinetic models. Error bars in (a) represent average standard deviations deduced for similar samples under identical release conditions.
