Umbilical ArteriesDuctus ArteriosusDuctus Arteriosus, PatentSingle Umbilical ArteryUltrasonography, PrenatalUmbilical VeinsUltrasonography, DopplerFetal Growth RetardationPlacental CirculationArteriesPregnancyBlood Flow VelocityGestational AgeHeart Rate, FetalUltrasonography, Doppler, PulsedPulsatile FlowUmbilical CordFetal DistressFetusFetal MonitoringPlacental InsufficiencyInfant, NewbornFetal DiseasesPulmonary ArteryCerebral ArteriesUltrasonography, Doppler, ColorPregnancy OutcomeFetal BloodFetal HeartPregnancy Trimester, ThirdMiddle Cerebral ArteryPlacentaPregnancy Trimester, SecondCarotid ArteriesFetal HypoxiaFemoral ArteryFetofetal TransfusionUterine ArteryRenal ArteryHernia, UmbilicalMesenteric ArteriesPregnancy Trimester, FirstBasilar ArteryPregnancy, High-RiskHallermann's SyndromeEndothelium, VascularPre-EclampsiaRegional Blood FlowProspective StudiesFetal DeathInfant, Small for Gestational AgeDigestive System AbnormalitiesApgar ScoreIliac ArteryVertebral ArteryCoronary Artery BypassMuscle, Smooth, VascularVascular ResistancePlacenta DiseasesSubclavian ArteryCardiotocographyRadial ArteryUterusMammary ArteriesAbnormalities, MultipleInfant, PrematureHuman Umbilical Vein Endothelial CellsCarotid Artery, InternalCesarean SectionFetal WeightHeart Defects, CongenitalVena Cava, InferiorMaternal-Fetal ExchangeCarotid Artery DiseasesCardiovascular AbnormalitiesUmbilicusLaser-Doppler FlowmetryVasoconstrictionChorionBlood CirculationSplenic ArteryBrachial ArteryReference ValuesSheepDihydralazineBirth WeightVasodilationPregnancy, ProlongedHepatic ArteryCarotid Artery, CommonHemodynamicsPrenatal DiagnosisUltrasonographyCoronary VesselsFetal MovementPregnancy Complications, CardiovascularSensitivity and SpecificityCells, CulturedAortaInfant, Premature, Diseases