Cord Blood Stem Cell TransplantationFetal BloodTransplantation, HomologousSpinal CordHematopoietic Stem Cell TransplantationBone Marrow TransplantationGraft vs Host DiseaseSpinal Cord InjuriesKidney TransplantationGraft SurvivalGraft RejectionTissue DonorsTransplantsTransplantation ConditioningUmbilical CordImmunosuppressive AgentsBlood BanksHistocompatibility TestingHematologic NeoplasmsInfant, NewbornAntigens, CD34Transplantation ChimeraHeart TransplantationHematopoietic Stem CellsTreatment OutcomeTime FactorsT-Lymphocytes