Cord Blood Stem Cell TransplantationMyeloablative AgonistsTransplantation, HomologousFetal BloodHematopoietic Stem Cell TransplantationTransplantation ConditioningGraft vs Host DiseaseBone Marrow TransplantationSpinal CordHematologic NeoplasmsWhole-Body IrradiationGraft SurvivalTransplantation, AutologousBusulfanHistocompatibility TestingTissue DonorsSpinal Cord InjuriesKidney TransplantationTransplantation ChimeraImmunosuppressive AgentsGraft RejectionTreatment OutcomeAntigens, CD34TransplantsVidarabineHematopoietic Stem CellsHistocompatibilityStem Cell TransplantationRecurrenceRetrospective StudiesUmbilical CordLeukemiaPeripheral Blood Stem Cell TransplantationCombined Modality TherapyUnrelated DonorsBlood BanksTime FactorsInfant, NewbornMelphalanRemission InductionSurvival AnalysisT-LymphocytesCyclophosphamideSiblingsHLA AntigensGraft vs Tumor EffectTransplantation, IsogeneicHeart TransplantationAntilymphocyte SerumHepatic Veno-Occlusive DiseaseSurvival RateCyclosporineLeukemia, Myeloid, AcuteMyelodysplastic SyndromesLymphocyte DepletionThiotepaBone Marrow PurgingGraft vs Leukemia Effect