[The earliest influence of contraception on the incidence of conception].
D003267:Contraception / Q000266:history*; D003273:Contraceptive Devices / Q000266:history; D003718:Denmark; D005260:Female; D049673:History, 20th Century; D006801:Humans; D007434:Intrauterine Devices / Q000266:history; D008297:Male
Den tidligste påvirkning af konceptionstallet ved praevention.