title: Which contingent sequential screening protocol?
authors.forename: Dave
authors.initials: D
authors.lastname: Wright
authors.forename: Ian
authors.initials: I
authors.lastname: Bradbury
authors.forename: Peter
authors.initials: P
authors.lastname: Benn
authors.forename: Howard
authors.initials: H
authors.lastname: Cuckle
authors.forename: Karen
authors.initials: K
authors.lastname: Ritchie
mesh_terms: D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D005865:Gestational Age; D006801:Humans; D048208:Nuchal Translucency Measurement; D011247:Pregnancy; D011296:Prenatal Diagnosis / Q000379:methods*