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First-trimester screening for trisomy-21 using a simplified method to assess the presence or absence of the fetal nasal bone

Simplified MethodPrenatal Genetic TestingPrenatal Genetic ScreeningPediatricsGynecologyMaternal HealthFetal MedicineFetal Nasal BonePrenatal DiagnosisMaternal-fetal MedicineFirst-trimester ScreeningPublic HealthPrenatal TestingMedicineFetal ComplicationEmbryology