DOI:
10.1055/s-00030576
Revista Brasileira de Ginecologia e Obstetrícia / RBGO Gynecology and Obstetrics
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References
Trussell J, Wynn LL.
Reducing unintended pregnancy in the United States.
Contraception 2008;
77 (01) 1-5 . Doi: 10.1016/j.contraception.2007.09.001
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