title: The effects of change in maternal age distribution upon the incidence of mongolism.
mesh_terms: D000293:Adolescent; D000328:Adult; D004314:Down Syndrome / Q000453:epidemiology*; D004739:England; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008423:Maternal Age; D011247:Pregnancy; D014852:Wales