title: First-trimester nuchal translucency screening.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Wald
mesh_terms: D004314:Down Syndrome / Q000000981:diagnostic imaging*; D005260:Female; D005865:Gestational Age; D006801:Humans; D009333:Neck / Q000000981:diagnostic imaging* / Q000196:embryology*; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal