title: Calculating correct Down's syndrome risks.
authors.forename: E M
authors.initials: EM
authors.lastname: Wallace
authors.forename: S
authors.initials: S
authors.lastname: Mulvey
mesh_terms: D004314:Down Syndrome / Q000209:etiology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011296:Prenatal Diagnosis; D018570:Risk Assessment