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Ultrasonographic dating of pregnancy causes significant errors in Down syndrome risk assessment that may be minimized by use of biparietal diameter—based means

Down SyndromeUltrasonographic DatingReproductive HealthDiagnosisGynecologyMaternal HealthPreterm Birth PredictionObstetricsPrenatal DiagnosisMaternal-fetal MedicinePublic HealthPrenatal TestingMedicineWomen's HealthHigh-risk Pregnancy