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Apparent first-order fitting of cidofovir release from formulations of PLGA-PEG-PLGA with and without additives in Franz diffusion cell experiments in vitro. PBS was the control. Symbols: closed diamonds, closed squares, closed triangles, open squares, open circles, open diamonds, closed circles, open triangles, and crosses represent Formulation #1 to #8 and PBS, respectively. CR is the concentration representing the cumulative amount of drug in the receiver at time t.
