Cord Blood Stem Cell TransplantationFetal BloodTransplantation, HomologousSpinal CordSpinal Cord InjuriesHematopoietic Stem Cell TransplantationGraft vs Host DiseaseBone Marrow TransplantationUmbilical CordTransplantation ConditioningBlood BanksInfant, NewbornAntigens, CD34Hematologic NeoplasmsTreatment Outcome