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Contraception > 2012 > 85 > 4 > 342-350
Contraception > 2009 > 80 > 4 > 372-380
Annals of Epidemiology > 2002 > 12 > 4 > 213-221
Contraception > 2012 > 85 > 4 > 342-350
Contraception > 2009 > 80 > 4 > 372-380
Annals of Epidemiology > 2002 > 12 > 4 > 213-221