title: The incidence of Down's syndrome over a 19-year period.
mesh_terms: D004314:Down Syndrome / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008423:Maternal Age; D011247:Pregnancy; D018566:Pregnancy, High-Risk; D013997:Time Factors