title: First-trimester screening for trisomy 21 using nuchal translucency and nasal bone evaluations in a selected and an unselected population.
authors.forename: J
authors.initials: J
authors.lastname: Sonek
authors.forename: S
authors.initials: S
authors.lastname: Cicero
authors.forename: K
authors.initials: K
authors.lastname: Nicolaides
mesh_terms: D004314:Down Syndrome / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D009295:Nasal Bone / Q000000981:diagnostic imaging*; D048208:Nuchal Translucency Measurement; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal