Evaluation of the efficacy, safety, and clinically recommended dose of dienogest in the treatment of primary dysmenorrhea: a randomized, double-blind, multicenter, placebo-controlled study

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To evaluate the efficacy, safety, and clinically recommended dose of dienogest (DNG; 0.5 mg/d, 1 mg/d, and 2 mg/d) in the treatment of primary dysmenorrhea.