Cord Blood Stem Cell TransplantationTransplantation, HomologousHematopoietic Stem Cell TransplantationStem Cell TransplantationUmbilical CordGraft vs Host DiseaseTransplantation ConditioningHematologic NeoplasmsFetal BloodCytomegalovirus InfectionsRoseolovirus InfectionsTransplantation, AutologousAspergillosisStem CellsHistocompatibility TestingTreatment OutcomeCytomegalovirusBone Marrow TransplantationSpinal CordHematopoietic Stem CellsRetrospective StudiesTissue DonorsTransplantation ChimeraPeripheral Blood Stem Cell TransplantationGraft SurvivalGraft vs Leukemia EffectBusulfanRecurrenceUmbilical VeinsUmbilical ArteriesMyeloablative AgonistsSpinal Cord InjuriesImmunosuppressive AgentsLeukemiaVidarabineRemission InductionAntigens, CD34Graft vs Tumor EffectHistocompatibilityImmunocompromised HostTime FactorsTransplantationWhole-Body IrradiationLeukemia, Myeloid, AcuteT-LymphocytesLeukemia, Myelogenous, Chronic, BCR-ABL PositiveMultiple MyelomaCells, CulturedEmbryonic Stem CellsCombined Modality TherapyLymphocyte DepletionHematopoietic Stem Cell MobilizationPrecursor Cell Lymphoblastic Leukemia-LymphomaCell DifferentiationSalvage TherapyOpportunistic InfectionsSiblingsSurvival AnalysisAdult Stem CellsVirus ActivationSurvival RateMycosesAnemia, AplasticHematologic DiseasesMesenchymal Stromal CellsChimerismAcute DiseaseBlood BanksInfant, NewbornFlow CytometryMyelodysplastic SyndromesHepatic Veno-Occlusive DiseasePregnancyHLA AntigensBlood Transfusion, AutologousGraft RejectionMinor Histocompatibility AntigensAntilymphocyte SerumLymphocyte TransfusionImmunosuppressionPluripotent Stem CellsHerpesvirus 6, HumanCell SeparationDisease-Free SurvivalBone Marrow CellsFollow-Up StudiesMesenchymal Stem Cell TransplantationGanciclovirAntineoplastic Combined Chemotherapy ProtocolsCyclophosphamideLeukocyte TransfusionFatal OutcomeMelphalanTransplantation ImmunologyNeoplasm, ResidualAntigens, CDProspective StudiesAntiviral AgentsImmunophenotypingLymphoproliferative Disorders