title: Rates of Down syndrome at the upper extreme of maternal age: considerations and recommendations in analysis.
authors.forename: Joan K
authors.initials: JK
authors.lastname: Morris
authors.forename: David
authors.initials: D
authors.lastname: Mutton
authors.forename: Eva
authors.initials: E
authors.lastname: Alberman
mesh_terms: D004314:Down Syndrome / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008423:Maternal Age; D008875:Middle Aged