DOI:
10.1055/s-00030576
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics
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References
Trussell J.
Contraceptive failure in the United States.
Contraception 2011;
83 (05) 397-404 . Doi: 10.1016/j.contraception.2011.01.021
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