Changing patterns of contraception.
D001723:Birth Rate; D003267:Contraception / Q000266:history / Q000379:methods / Q000639:trends*; D005193:Family Planning Services / Q000639:trends; D005260:Female; D007722:Health Knowledge, Attitudes, Practice; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008297:Male; D006113:United Kingdom