Blood BanksUmbilical CordBlood DonorsPlacentaFetal BloodBlood Transfusion, AutologousSpinal CordUmbilical VeinsOocyte DonationUmbilical ArteriesBlood SafetyDonor SelectionBlood TransfusionSpinal Cord InjuriesCord Blood Stem Cell TransplantationPregnancyAltruismTissue and Organ ProcurementObstetric Surgical ProceduresDirected Tissue DonationInfant, NewbornPlacenta DiseasesTissue DonorsMaternal-Fetal ExchangePlateletpheresisHernia, UmbilicalPlacenta PreviaAntigens, CD34Placenta AccretaGestational AgePlacenta, RetainedErythrocyte CountHematopoietic Stem CellsUrachal CystPhlebotomyCells, CulturedFetusBrain DeathCompensation and RedressBlood-Borne PathogensBlood Loss, SurgicalPreoperative CareWharton JellyMotivationUltrasonography, PrenatalLiving DonorsIronTime FactorsMesenchymal Stromal CellsFerritinsTrophoblastsHuman Umbilical Vein Endothelial CellsSpinal Cord DiseasesProspective StudiesCell DifferentiationUmbilicusDeathSpinal Cord CompressionGift GivingNew EnglandHemoglobinsHematopoietic Stem Cell TransplantationPresumed ConsentWest Nile Fever