Dose-Response Relationship, DrugTime FactorsCell Transformation, ViralCord Blood Stem Cell TransplantationAntigens, CD34Histocompatibility TestingGraft SurvivalGraft vs Host DiseaseHematologic NeoplasmsBlood Cell CountTransplantation, HomologousHematopoietic Stem Cell TransplantationDose-Response Relationship, RadiationTransplantation, IsogeneicTransplantation ConditioningFetal BloodOxytropisBone Marrow TransplantationHematopoietic Stem CellsCell CountTransplantation, AutologousPeripheral Blood Stem Cell Transplantation