IsomerismHeterotaxy SyndromeHeart Defects, CongenitalHeart AtriaSitus InversusHeart Septal DefectsAbnormalities, MultipleVenae CavaeDextrocardiaLevocardiaHeart Bypass, RightPulmonary VeinsErythrocruorinsPulmonary Veno-Occlusive DiseaseGrowth Differentiation Factor 1Fetal HeartCyanosisAbortion, EugenicNodal ProteinAtrioventricular NodeFetal DiseasesVena Cava, InferiorFontan ProcedureAzygos VeinTachycardia, SupraventricularSinoatrial NodeHeart BlockUltrasonography, PrenatalHeart ValvesAtrial AppendageHeart Septal Defects, AtrialMagnetic Resonance SpectroscopyProlinePrenatal DiagnosisInfant, NewbornSyndromeBody PatterningStereoisomerismPregnancyEchocardiographyAsiaGestational AgeMolecular StructureSpleenModels, MolecularStomachRetrospective StudiesProtein ConformationTreatment OutcomeFollow-Up StudiesTime Factors