title: Which contingent sequential screening protocol?
authors.forename: Severin Olesen
authors.initials: SO
authors.lastname: Larsen
authors.forename: Michael
authors.initials: M
authors.lastname: Christiansen
authors.forename: Bent
authors.initials: B
authors.lastname: Norgaard-Pedersen
mesh_terms: D015415:Biomarkers / Q000032:analysis; D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008403:Mass Screening / Q000379:methods*; D048208:Nuchal Translucency Measurement; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011262:Pregnancy Trimester, Second; D011296:Prenatal Diagnosis / Q000379:methods*
chemical_list: D015415:Biomarkers