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Description:Finally the diffusion coefficient can be estimated by Stokes-Einstein equation: A ground-electrode placed anywhere on the body completes the electric circuit. It establishes a broad framework for the topic and a foundation for continued research. Best physical stability was observed when propylene glycol was used, when the variation of the flow of ibuprofen was proportional to the concentration of the vehicle. Effect of vehicle and percutaneous penetration enhancers.

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