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Ethinylestradiol/etonogestrel vaginal ring provides better cycle control than ethinylestradiol/levonorgestrel oral contraceptive. Inpharma Wkly. 1338, 18 (2002). https://doi.org/10.2165/00128413-200213380-00048
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DOI: https://doi.org/10.2165/00128413-200213380-00048