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A Double Blinded, Prospective, Randomized, Vehicle Controlled Multi-center Study of Photodynamic Therapy With Visonac® Cream in Patients With Acne Vulgaris
This study is intended to evaluate the efficacy and safety of Visonac Photodynamic Therapy (PDT) in patients with severe acne, score 4 on global IGA scale. The null hypothesis is that Visonac PDT is equal to vehicle PDT against the alternative hypothesis that Visonac PDT is different compared to vehicle PDT at week 12.
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