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ObstetricsBeneficenceUltrasonography, PrenatalPregnancyUltrasonographyEquipment SafetyFetal DiseasesGestational AgePregnant WomenPregnancy Complications, InfectiousWomen's HealthWomenPregnancy ComplicationsPrenatal CarePregnancy Trimester, ThirdUltrasonicsUltrasonic TherapyPregnancy Complications, ParasiticInfant, NewbornHigh-Intensity Focused Ultrasound AblationPregnancy OutcomeUltrasonography, InterventionalPregnancy Trimester, SecondInfectious Disease Transmission, VerticalMicrobubblesPregnancy TrimestersPregnancy Complications, HematologicPregnancy Complications, CardiovascularPregnancy Trimester, FirstPre-EclampsiaRisk FactorsPrenatal DiagnosisSensitivity and SpecificityPostpartum PeriodCross-Sectional StudiesBattered WomenTransducersParityProspective StudiesUltrasonography, DopplerCohort StudiesQuestionnairesVaginaUltrasonography, Doppler, ColorReproducibility of ResultsCesarean SectionAbortion, SpontaneousMass ScreeningRetrospective StudiesFollow-Up StudiesDiabetes, GestationalHIV InfectionsTime FactorsPregnancy Complications, NeoplasticPredictive Value of TestsCase-Control StudiesDelivery, ObstetricGravidityMicroscopy, AcousticWomen's RightsToxoplasmosisTreatment OutcomeImaging, Three-DimensionalSocioeconomic FactorsWomen, WorkingAge FactorsBirth WeightObstetric Labor, PrematureWomen's Health ServicesPlacentaPrevalencePregnancy, High-RiskUnited StatesMaternal Health ServicesEndosonographyMaternal-Fetal ExchangePostmenopauseContrast MediaLogistic ModelsMaternal ExposureIncidenceSex FactorsHealth Knowledge, Attitudes, PracticeMaternal WelfareCervix UteriReference ValuesBody Mass IndexEchoencephalographyAmniocentesisFetusFetal DevelopmentLabor, ObstetricAbortion, InducedRisk AssessmentFetal BloodUltrasonography, MammarySonicationPuerperal DisordersMaternal AgeUltrasonography, Doppler, Pulsed