Cord Blood Stem Cell TransplantationFetal BloodTransplantation, HomologousSpinal CordSurvival RateCell SurvivalHematopoietic Stem Cell TransplantationSpinal Cord InjuriesGraft vs Host DiseaseGraft SurvivalBone Marrow TransplantationUmbilical CordTransplantation ConditioningDisease-Free SurvivalBlood BanksSurvival AnalysisInfant, NewbornAntigens, CD34Treatment OutcomeSurvivalHematologic NeoplasmsHematopoietic Stem CellsTime Factors