Umbilical ArteriesUltrasonography, DopplerSingle Umbilical ArteryUltrasonography, PrenatalUltrasonography, Doppler, ColorFetal Growth RetardationUmbilical VeinsPlacental CirculationUltrasonography, Doppler, PulsedArteriesBlood Flow VelocityPregnancyHeart Rate, FetalPulsatile FlowGestational AgeUmbilical CordFetal DistressDoppler EffectFetal MonitoringPlacental InsufficiencyCerebral ArteriesFetusFetal DiseasesPulmonary ArteryMiddle Cerebral ArteryPregnancy OutcomeInfant, NewbornFetal BloodPregnancy Trimester, ThirdUltrasonography, Doppler, TranscranialEchocardiography, Doppler, PulsedUterine ArteryCarotid ArteriesPregnancy Trimester, SecondPlacentaRegional Blood FlowEchocardiography, Doppler, ColorFemoral ArteryRenal ArteryFetal HeartLaser-Doppler FlowmetryFetal HypoxiaProspective StudiesFetofetal TransfusionMesenteric ArteriesHernia, UmbilicalPre-EclampsiaBasilar ArteryPregnancy, High-RiskUltrasonographyInfant, Small for Gestational AgeVascular ResistanceEndothelium, VascularHallermann's SyndromeUterusVertebral ArteryPregnancy Trimester, FirstFetal DeathPlacenta DiseasesIliac ArteryApgar ScoreDigestive System AbnormalitiesCoronary Artery BypassDiastoleSensitivity and SpecificityRadial ArteryMammary ArteriesCardiotocographyOphthalmic ArteryCarotid Artery DiseasesMuscle, Smooth, VascularHemodynamicsFetal WeightSubclavian ArteryHuman Umbilical Vein Endothelial CellsPredictive Value of TestsReference ValuesCarotid Artery, InternalCesarean SectionBrachial ArterySplenic ArteryCoronary VesselsMaternal-Fetal ExchangeBlood CirculationChorionHepatic ArteryPregnancy, ProlongedFetal MovementUmbilicusAbnormalities, MultipleVasodilationDuctus ArteriosusCerebrovascular CirculationReproducibility of ResultsOligohydramniosMesenteric Artery, SuperiorDihydralazineVasoconstrictionCardiovascular AbnormalitiesRheology