Fetal HeartHeart Defects, CongenitalUltrasonography, PrenatalEchocardiography, Four-DimensionalFetal DiseasesPregnancyGestational AgeAbnormalities, MultiplePregnancy Trimester, SecondDextrocardiaCor TriatriatumSitus InversusFetoscopyMagnetocardiographyEchocardiographyHeartMyocytes, CardiacFetoscopesPulmonary Valve StenosisNoonan SyndromePrenatal DiagnosisHeart Rate, FetalInfant, NewbornCardiac Surgical ProceduresCardiac VolumeRhabdomyomaHeart VentriclesTwins, ConjoinedHeart Septal DefectsHeterotaxy SyndromeEchocardiography, Three-DimensionalCardiovascular AbnormalitiesCardiac OutputHeart Septal Defects, AtrialCoronary Vessel AnomaliesCongenital AbnormalitiesRetrospective StudiesTransposition of Great VesselsSyndromeEbstein AnomalyCholedochal CystHeart Septal Defects, VentricularFetusUmbilical ArteriesPlacental InsufficiencyDiGeorge SyndromeDiverticulumPregnancy Trimester, FirstPulmonary ArteryEchocardiography, Doppler, ColorCardiomegalySensitivity and SpecificityFetal MonitoringKaryotypingPregnancy Trimester, ThirdBiliary AtresiaVentricular FunctionCardiotocographyVena Cava, SuperiorMyocardial ContractionVentricular DysfunctionArrhythmias, CardiacHydrops FetalisDuctus Arteriosus, PatentAortic CoarctationHeart NeoplasmsHeart BlockChromosomes, Human, Pair 22Death, Sudden, CardiacProspective StudiesMyocardiumCardiomyopathiesTreatment OutcomeReproducibility of ResultsImage Interpretation, Computer-AssistedHeart AtriaFetofetal TransfusionDuctus ArteriosusEchocardiography, DopplerFetal DevelopmentHypoplastic Left Heart SyndromeFollow-Up Studies