CarboxyhemoglobinCarbon Monoxide PoisoningMethemoglobinCarbon MonoxideSulfhemoglobinOximetryMethylene ChlorideHemoglobinsSmoke Inhalation InjuryMethemoglobinemiaOxyhemoglobinsBlood Gas Monitoring, TranscutaneousDithioniteBarium CompoundsPotassium CompoundsChromatography, GasSpectrophotometryPhotolysisSmoking