Age at menarche: a misunderstanding.
D000293:Adolescent; D000367:Age Factors; D002648:Child; D004739:England; D005260:Female; D006666:History of Medicine; D049672:History, 19th Century; D049673:History, 20th Century; D049691:History, Medieval; D006801:Humans; D008598:Menstruation; D014481:United States