Infertility, MaleOligospermiaAzoospermiaAsthenozoospermiaChromosomes, Human, YSpermatogenesisSpermatozoaSperm MotilitySperm CountInfertilityInfertility, FemaleTestisSex Chromosome AberrationsSemen AnalysisMesteroloneSemenVaricoceleIntestinal ObstructionAirway ObstructionSex Chromosome Disorders of Sex DevelopmentSeminal Plasma ProteinsHydrocarbons, BrominatedFertilitySequence Tagged SitesY ChromosomeUreteral ObstructionKlinefelter SyndromeSperm Injections, IntracytoplasmicChromosome DeletionTestosteroneReproductive Techniques, AssistedPregnancyAneuploidyChromosome AberrationsSertoli Cell-Only SyndromeDuodenal ObstructionFertilization in VitroAndrologyKaryotypingOrchitisUrinary Bladder Neck ObstructionUrethral ObstructionIn Situ Hybridization, FluorescenceNasal ObstructionAbnormal KaryotypeGastric Outlet ObstructionVasovasostomySperm RetrievalEpididymisSpermatidsVentricular Outflow ObstructionSertoli CellsProtaminesFallopian Tube DiseasesReproductive TechniquesPolymerase Chain ReactionSperm TailPregnancy RateSeminiferous TubulesLacrimal Duct ObstructionTesticular DiseasesReproductive MedicineEjaculationSperm-Ovum InteractionsSperm MaturationAcrosomeKartagener SyndromeGenital Diseases, MaleFertility Agents, MaleInsemination, ArtificialFertilizationEndometriosisCryptorchidismHysterosalpingographyCiliary Motility DisordersSpermatogoniaAcrosome ReactionPregnancy OutcomeCase-Control StudiesFollicle Stimulating HormoneAxonemal DyneinsSperm HeadSpermatocytesHypogonadismEpididymitisEjaculatory DuctsVas DeferensMicrosurgeryEmbryo TransferMeiosisUrologic Surgical Procedures, MaleClomipheneCholestasisGene DeletionZona PellucidaHydronephrosisCholestasis, ExtrahepaticMutationInseminationSperm Capacitation