DOI:
10.1055/s-00030576
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics
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References
Roumen FJ.
The contraceptive vaginal ring compared with the combined oral contraceptive pill: a comprehensive review of randomized controlled trials.
Contraception 2007;
75 (06) 420-429 . Doi: 10.1016/j.contraception.2007.01.013
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