title: Estimations of gestational age and screening for Down's syndrome.
authors.forename: S
authors.initials: S
authors.lastname: Holding
mesh_terms: D004314:Down Syndrome / Q000175:diagnosis*; D005260:Female; D005820:Genetic Testing; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D012307:Risk Factors; D012984:Software