Cord Blood Stem Cell TransplantationBone Marrow TransplantationTissue DonorsFetal BloodUmbilical CordBone MarrowHistocompatibility TestingBone Marrow CellsHistocompatibilityTissue and Organ ProcurementTransplantation, HomologousHLA AntigensGraft vs Host DiseaseBone and BonesHematopoietic Stem CellsBlood BanksUmbilical VeinsAntigens, CD34Umbilical ArteriesRegistriesHematopoietic Stem Cell TransplantationBlood DonorsInfant, NewbornPregnancyAnemia, AplasticCells, CulturedSpinal CordCell DifferentiationTransplantation ConditioningGraft SurvivalLeukemiaBone RemodelingBone Marrow DiseasesColony-Forming Units AssayBone Marrow ExaminationLiving DonorsWhole-Body IrradiationHematopoiesisBone Marrow NeoplasmsHematologic NeoplasmsCell SeparationMesenchymal Stromal CellsFlow Cytometry