Nuchal CordBlood Gas AnalysisFetal BloodUmbilical CordCord Blood Stem Cell TransplantationCarbon DioxideBlood BanksOxygenAcid-Base ImbalanceUmbilical VeinsGasesPartial PressureUmbilical ArteriesInfant, NewbornAntigens, CD34CapnographyPulmonary Gas ExchangePregnancyHematopoietic Stem CellsSpinal CordBlood Gas Monitoring, TranscutaneousOximetry