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PregnancyUltrasonographyPregnancy OutcomePregnancy ComplicationsPregnancy, AnimalPregnancy, EctopicUltrasonography, Doppler, ColorUltrasonography, PrenatalPregnancy Trimester, FirstUltrasonography, DopplerPregnancy Trimester, ThirdPregnancy RatePregnancy Complications, CardiovascularPregnancy TestsPregnancy TrimestersPregnancy Trimester, SecondPregnancy, MultiplePregnancy, TubalPregnancy in DiabeticsPregnancy Complications, NeoplasticPregnancy in AdolescenceGestational AgePregnancy Complications, InfectiousEndosonographyAbortion, SpontaneousPregnancy, High-RiskUltrasonography, Doppler, DuplexUltrasonography, Doppler, PulsedPregnancy ProteinsInfant, NewbornPregnancy, UnplannedPregnancy, UnwantedUltrasonography, MammaryProspective StudiesUterusUltrasonography, InterventionalPregnancy Complications, HematologicSensitivity and SpecificityPlacentaFetal DeathPre-EclampsiaPregnancy, AbdominalPregnancy, ProlongedNeisseria meningitidis, Serogroup BFetal DiseasesAbortion, InducedUltrasonography, Doppler, TranscranialEmbryo TransferRetrospective StudiesFertilization in VitroPregnancy Complications, ParasiticEmbryo ImplantationPregnancy MaintenancePrenatal DiagnosisProgesteroneMedical Laboratory SciencePrenatal CareFetusSulfur HexafluorideBirth WeightMaternal-Fetal ExchangeTomography, X-Ray ComputedRisk FactorsCongenital AbnormalitiesFetal Growth RetardationCesarean SectionPredictive Value of TestsPrenatal Exposure Delayed EffectsInsemination, ArtificialInfertility, FemaleFetal DevelopmentContrast MediaMaternal AgeBlood Flow VelocityPregnancy Reduction, MultifetalAbortion, TherapeuticReproducibility of ResultsHypertension, Pregnancy-InducedObstetric Labor, PrematureTime FactorsTwinsEndometriumLactationChorionic GonadotropinPremature BirthImaging, Three-DimensionalUrographyAbortifacient Agents, NonsteroidalAmniotic FluidAbnormalities, Drug-InducedAbortion, HabitualScrotumPuerperal DisordersDeciduaSan MarinoLabor, ObstetricUterine HemorrhagePlacenta DiseasesCohort StudiesFertility