Embryo TransferSingle Embryo TransferFertilization in VitroPregnancy RateEmbryo ImplantationPregnancyEmbryo, MammalianCryopreservationPregnancy, MultipleSperm Injections, IntracytoplasmicPregnancy OutcomeBlastocystLive BirthInfertilityInfertility, FemaleEmbryo, NonmammalianOvulation InductionChick EmbryoCleavage Stage, OvumZygote Intrafallopian TransferTwinsOocyte DonationReproductive Techniques, AssistedReproductive TechniquesEmbryonic DevelopmentEmbryonic and Fetal DevelopmentBlastomeresAbortion, SpontaneousOocytesChorionic GonadotropinEmbryo Culture TechniquesBirth RatePreimplantation DiagnosisMorulaGene Transfer TechniquesUterusOvarian Hyperstimulation SyndromeMenotropinsVitrificationEmbryo LossEndometriumCloning, OrganismOocyte RetrievalFallopian Tube DiseasesTime FactorsPregnancy, EctopicSuperovulationNuclear Transfer TechniquesInsemination, ArtificialMaternal AgeRetrospective StudiesGene Transfer, HorizontalPregnancy Reduction, MultifetalFertilizationBuserelinZona PellucidaCatheterizationFreezingPregnancy, TwinProgesteroneUltrasonographyCulture TechniquesZygoteMultiple Birth OffspringTwinning, MonozygoticLuteal PhaseGene Expression Regulation, DevelopmentalSpermatozoaPregnancy, TubalFollicle Stimulating HormoneFertility Agents, FemaleSurrogate MothersIncubatorsFallopian TubesTripletsOvaryFollicular FluidCattleGonadotropin-Releasing HormoneProspective StudiesMicroinjectionsEstradiolPregnancy, AnimalMicromanipulationChorionic Gonadotropin, beta Subunit, HumanMolecular Sequence DataLabor Stage, FirstNafarelinLitter SizeAbortion, VeterinaryGamete Intrafallopian TransferTreatment OutcomePregnancy MaintenanceFetal ViabilityUterine ContractionSpecimen HandlingPregnancy TestsTransfer (Psychology)Infertility, MaleTwins, Monozygotic