AzoospermiaOligospermiaInfertility, MaleChromosomes, Human, YAsthenozoospermiaSperm CountSpermatozoaSpermatogenesisSperm MotilitySex Chromosome AberrationsSex Chromosome Disorders of Sex DevelopmentTestisSemenSemen AnalysisVaricoceleSeminal Plasma ProteinsMesteroloneKlinefelter SyndromeSperm RetrievalY ChromosomeSequence Tagged SitesSperm Injections, IntracytoplasmicHydrocarbons, BrominatedChromosome DeletionFertilityAneuploidyTesticular DiseasesTestosteroneKaryotypingChromosome AberrationsVasectomyVasovasostomyIn Situ Hybridization, FluorescenceMicrosurgeryEjaculationXYY KaryotypeSpermatidsGenetic LociSertoli Cell-Only SyndromeProtaminesPregnancyEjaculatory DuctsGenital Diseases, MalePolymerase Chain ReactionFollicle Stimulating HormoneReproductive TechniquesContraceptive Agents, MaleAbnormal KaryotypeCryptorchidismFertilization in VitroSpermatic CordChromosomes, Human, XEpididymisSertoli CellsSuctionReproductive Techniques, AssistedVas DeferensBiopsyChromosomes, Human, Pair 18Tissue and Organ HarvestingChromosomes, Human, Pair 21Chromosomes, Human, Pair 13Gene DeletionCryopreservationPachytene StageInhibinsEmbryo TransferPregnancy RateSemen PreservationRNA-Binding ProteinsMicroinjectionsAcrosome ReactionMeiosisInfertilityCase-Control StudiesSperm HeadUrologic Surgical Procedures, MaleSperm-Ovum InteractionsEpitestosteroneMenDNA FragmentationMosaicismTuberculosis, Male GenitalGenetic TestingSperm MaturationUreaplasma urealyticum