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Rushforth, B. (2009). Efficacy of a combined oral contraceptive containing 0.030 mg ethinylestradiol/2 mg dienogest for the treatment of papulopustular acne in comparison with placebo and 0.035 mg ethinylestradiol/2 mg cyproterone acetate. Journal of family planning and reproductive health care. 35 (3), p. 150. [Online].