Cord Blood Stem Cell TransplantationFetal BloodHematopoietic Stem Cell TransplantationTransplantation, HomologousTransplantation ChimeraGraft vs Host DiseaseTissue DonorsHematologic NeoplasmsHistocompatibility TestingTransplantation ConditioningTreatment OutcomeLeukocytes, MononuclearKidney TransplantationTransplantsGraft RejectionGraft SurvivalImmunosuppressive AgentsRetrospective StudiesLymphocytesTime FactorsPeripheral NervesT-LymphocytesHeart TransplantationPeripheral Blood Stem Cell TransplantationFlow CytometryTransplantationBone Marrow TransplantationMonocytesLymphocyte ActivationBlood CellsCells, CulturedInfant, NewbornLung TransplantationTransplantation, AutologousPolymerase Chain ReactionFollow-Up StudiesLeukocyte CountProspective StudiesPediatricsPostoperative ComplicationsCyclosporinePeripheral Nervous SystemHematopoietic Stem Cell MobilizationPeripheral Nervous System DiseasesTacrolimusImmunophenotypingImmunosuppressionAntigens, CDB-LymphocytesLeukocytesImmunocompromised HostCD4-Positive T-LymphocytesLeukapheresisLiving DonorsHematopoietic Stem CellsPhytohemagglutininsCytokinesCytomegalovirus InfectionsRisk FactorsRecurrenceBone MarrowPeripheral Vascular DiseasesAntibodies, MonoclonalAcute DiseaseTissue and Organ ProcurementCase-Control StudiesInterferon-gammaGranulocyte Colony-Stimulating FactorAntigens, CD34Age FactorsBiological MarkersHospitals, PediatricRNA, MessengerLymphocyte CountCell SeparationPrognosisKidney Failure, ChronicPrecursor Cell Lymphoblastic Leukemia-LymphomaLeukemiaIntensive Care Units, PediatricSurvival RateInterleukin-2Cohort StudiesSensitivity and SpecificityDose-Response Relationship, DrugT-Lymphocyte SubsetsBiopsyWaiting ListsMolecular Sequence DataReverse Transcriptase Polymerase Chain ReactionSurvival AnalysisBlood Cell CountKiller Cells, NaturalNeoplasmsEnzyme-Linked Immunosorbent AssayCD8-Positive T-LymphocytesFetal Tissue TransplantationTransplantation ImmunologyIncidenceAntigens, CD3