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(a) Schematic description of the electrohydrodynamic (EHD) technique. SEM images of drug-loaded polycaprolactone (PCL)/polyvinyl pyrrolidone (PVP) patches at selected time intervals for the in vitro release study. (b) At 30 min; (c) At 60 min; and (d) At 90 min. Reproduced with permission from Ref. [42].
