title: Prenatal screening for Down's syndrome.
authors.forename: Zarko
authors.initials: Z
authors.lastname: Alfirevic
mesh_terms: D002170:Canada; D003718:Denmark; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*