Cord Blood Stem Cell TransplantationDirected Tissue DonationFetal BloodUmbilical CordHematopoietic Stem Cell TransplantationTransplantation ChimeraGraft vs Host DiseaseHematologic NeoplasmsHistocompatibility TestingTransplantation ConditioningTissue DonorsTransplantation, HomologousBlood BanksSpinal CordUmbilical VeinsInfant, NewbornAntigens, CD34Treatment OutcomeUmbilical ArteriesPrivate SectorSpinal Cord InjuriesPregnancyHematopoietic Stem CellsMaternal-Fetal ExchangeCells, CulturedPrivate PracticeHospitals, PrivateGraft Survival