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Edelman AB, Gallo MF, Jensen JT, et al. Continuous or extended cycle vs. cyclic use of combined oral contraceptives for contraception. Cochrane Database Syst Rev 2005; (3): CD004695
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Bednarek, P. Continuous-Use Ethinylestradiol/Levonorgestrel 20µg/90µg as an Oral Contraceptive. Drugs 67, 2480 (2007). https://doi.org/10.2165/00003495-200767160-00010
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DOI: https://doi.org/10.2165/00003495-200767160-00010