Cord Blood Stem Cell TransplantationHematopoietic Stem Cell TransplantationTransplantation, HomologousGraft vs Host DiseaseTransplantation ConditioningHematologic NeoplasmsFetal BloodGraft vs Leukemia EffectGraft vs Tumor EffectLeukemiaTransplantation, AutologousBone Marrow TransplantationSpinal CordTreatment OutcomeRetrospective StudiesRecurrenceAcute DiseaseSpinal Cord InjuriesTime FactorsTransplantation ChimeraSurvival RateTissue DonorsHistocompatibility TestingT-LymphocytesGraft SurvivalIsoantigensLymphocyte Culture Test, MixedHistocompatibilityFollow-Up StudiesWhole-Body IrradiationUmbilical CordStem Cell TransplantationBlood BanksRisk FactorsAntigens, CD34Prospective StudiesTransplantation, IsogeneicBusulfanMyeloablative AgonistsInfant, NewbornHematopoietic Stem CellsLymphocyte ActivationChimerismTransplantation ImmunologyVidarabineLeukemia, Myeloid, AcuteSkin TransplantationHLA AntigensImmunosuppressive AgentsPeripheral Blood Stem Cell TransplantationGraft RejectionLymphocyte DepletionGraft vs Host ReactionHematologic DiseasesRemission InductionImmunosuppression