Sperm Injections, IntracytoplasmicTestisFertilization in VitroSpermatozoaMicroinjectionsInfertility, MaleSperm HeadOligospermiaEmbryo TransferSperm CountPregnancyPregnancy RateReproductive TechniquesOocytesSperm RetrievalCryopreservationInjectionsMicromanipulationPregnancy OutcomeFertilizationSemen PreservationSperm MotilitySperm-Ovum InteractionsEjaculationCytoplasmCleavage Stage, OvumEpididymisInsemination, ArtificialEmbryo ImplantationSperm CapacitationSemenSperm MaturationAzoospermiaReproductive Techniques, AssistedSpermatogenesisSpermatidsY ChromosomeInfertilityAcrosomeZona PellucidaBlastocystPregnancy, MultipleEmbryo, MammalianZygoteEmbryonic and Fetal DevelopmentOvulation InductionOocyte RetrievalSuctionKlinefelter SyndromeSemen AnalysisInfertility, FemaleRete TestisEmbryonic DevelopmentSperm TailVasovasostomyTripletsSex Chromosome AberrationsFertilityChromosome AberrationsFollicle Stimulating HormoneAbortion, SpontaneousCongenital AbnormalitiesSperm TransportLive BirthMenotropinsInsemination, Artificial, HomologousSertoli CellsEmbryo Culture TechniquesAneuploidyMicrosurgeryVasectomyMicroscopy, ElectronKaryotypingDigestive System AbnormalitiesPovidoneCryptorchidismInseminationSperm MidpieceVas DeferensCell NucleusParthenogenesisMetaphaseTesticular NeoplasmsInjections, IntravenousTime FactorsInclusion BodiesTwinsInjections, IntramuscularCryoprotective AgentsFollicular FluidProtaminesFollicle Stimulating Hormone, HumanTestosteroneRetrospective StudiesHorsesPreimplantation DiagnosisIn Situ Hybridization, FluorescenceTesticular DiseasesInclusion Bodies, ViralSperm Banks