Tournemire, A Prenasal thickness to nasal bone length ratio: effectiveness as a second or third trimester marker for Down syndrome. [electronic resource] - European journal of obstetrics, gynecology, and reproductive biology Aug 2015 - 28-32 p. digital Publication Type: Comparative Study; Evaluation Study; Journal Article ISSN: 1872-7654 Standard No.: 10.1016/j.ejogrb.2015.05.011 doi Subjects--Topical Terms: AdultAlgorithmsBiomarkersBone DevelopmentDown Syndrome--diagnostic imagingFemaleFrance--epidemiologyHumansNasal Bone--diagnostic imagingNasal Cartilages--diagnostic imagingObserver VariationPregnancyPregnancy Trimester, SecondPregnancy Trimester, ThirdROC CurveRetrospective StudiesSensitivity and SpecificitySingle-Blind MethodUltrasonography, PrenatalYoung Adult