Embryo TransferSingle Embryo TransferFertilization in VitroPregnancy RateEmbryo ImplantationPregnancyEmbryo, MammalianCryopreservationPregnancy, MultipleSperm Injections, IntracytoplasmicPregnancy OutcomeBlastocystLive BirthInfertilityEmbryo, NonmammalianInfertility, FemaleOvulation InductionCleavage Stage, OvumChick EmbryoZygote Intrafallopian TransferOocyte DonationTwinsEmbryonic DevelopmentReproductive Techniques, AssistedReproductive TechniquesUterusEmbryonic and Fetal DevelopmentEndometriumBlastomeresAbortion, SpontaneousChorionic GonadotropinOocytesEmbryo Culture TechniquesEmbryo Implantation, DelayedEmbryo LossPreimplantation DiagnosisBirth RateTime FactorsMorulaVitrificationMenotropinsGene Transfer TechniquesOvarian Hyperstimulation SyndromeFallopian Tube DiseasesRetrospective StudiesTreatment OutcomeOocyte RetrievalCochlear ImplantationCloning, OrganismCatheterizationProgesteronePregnancy, EctopicSuperovulationNuclear Transfer TechniquesZona PellucidaMaternal AgeFertilizationLens Implantation, IntraocularPregnancy, AnimalInsemination, ArtificialPregnancy, TubalBuserelinProspective StudiesCulture TechniquesZygoteLuteal PhasePregnancy Reduction, MultifetalGene Transfer, HorizontalGene Expression Regulation, DevelopmentalFreezingPregnancy, TwinUltrasonographyEstradiolFallopian TubesMultiple Birth OffspringFollicle Stimulating HormoneSpermatozoaFertility Agents, FemaleTwinning, MonozygoticIncubatorsOvaryPregnancy MaintenanceGonadotropin-Releasing HormoneLitter SizeSurrogate MothersTripletsMicroinjectionsFollicular FluidMicromanipulationFetal ViabilityCattleChorionic Gonadotropin, beta Subunit, HumanPacemaker, ArtificialNafarelinLabor Stage, FirstAbortion, VeterinaryStentsGamete Intrafallopian TransferProsthesis DesignOvulation