Cord Blood Stem Cell TransplantationFetal BloodTransplantation, HomologousSpinal CordLeukocytes, MononuclearHematopoietic Stem Cell TransplantationGraft vs Host DiseaseSpinal Cord InjuriesBone Marrow TransplantationT-LymphocytesLymphocytesAntigens, CD34Lymphocyte ActivationTransplantation ConditioningCells, CulturedHematopoietic Stem CellsUmbilical CordFlow CytometryBlood CellsPeripheral Blood Stem Cell TransplantationBlood BanksInfant, NewbornHematologic NeoplasmsPeripheral NervesMonocytesImmunophenotypingAntigens, CDTransplantation ChimeraGraft SurvivalCell SeparationLymphocyte Culture Test, MixedTime FactorsHistocompatibility Testing