title: Trends in prenatal diagnosis of Down's syndrome.
authors.forename: K
authors.initials: K
authors.lastname: Spencer
mesh_terms: D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D005315:Fetal Diseases / Q000175:diagnosis*; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000639:trends*; D016216:Ultrasonography, Prenatal