Embryo TransferSingle Embryo TransferPregnancy, MultiplePregnancy RateFertilization in VitroTwinsLive BirthSperm Injections, IntracytoplasmicPregnancyCryopreservationEmbryo ImplantationReproductive Techniques, AssistedMolecular Sequence DataEmbryo, MammalianBase SequencePregnancy OutcomeBlastocystInfertilityInfertility, FemaleEmbryo, NonmammalianOvulation InductionChick EmbryoCleavage Stage, OvumZygote Intrafallopian TransferOocyte DonationReproductive TechniquesEmbryonic DevelopmentEmbryonic and Fetal DevelopmentBlastomeresAbortion, SpontaneousOocytesChorionic GonadotropinEmbryo Culture TechniquesBirth RatePreimplantation DiagnosisMorulaGene Transfer TechniquesOvarian Hyperstimulation SyndromeUterusMenotropinsVitrificationEmbryo LossEndometriumCloning, OrganismFallopian Tube DiseasesOocyte RetrievalPregnancy, EctopicSuperovulationNuclear Transfer TechniquesMaternal AgeTime FactorsInsemination, ArtificialPregnancy Reduction, MultifetalBuserelinFertilizationZona PellucidaGene Transfer, HorizontalPregnancy, TwinRetrospective StudiesCatheterizationProgesteroneCulture TechniquesZygoteUltrasonographyMultiple Birth OffspringFreezingTwinning, MonozygoticLuteal PhaseGene Expression Regulation, DevelopmentalPregnancy, TubalSpermatozoaFollicle Stimulating HormoneSurrogate MothersIncubatorsFertility Agents, FemaleFallopian TubesTripletsFollicular FluidOvaryMicroinjectionsGonadotropin-Releasing HormoneMicromanipulationEstradiolPregnancy, AnimalLabor Stage, FirstNafarelinChorionic Gonadotropin, beta Subunit, HumanLitter SizeCattleAbortion, VeterinaryPregnancy MaintenanceGamete Intrafallopian TransferFetal ViabilityProspective StudiesUterine ContractionTransfer (Psychology)Treatment OutcomePregnancy TestsTwins, MonozygoticInfertility, Male