title: Screening for Down's syndrome.
authors.forename: I R
authors.initials: IR
authors.lastname: McFadyen
mesh_terms: D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D006801:Humans; D008423:Maternal Age; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*