Breath TestsChromatography, High Pressure LiquidExhalationIonic LiquidsChromatography, LiquidLiquid CrystalsOphthalmic SolutionsPentanesBreath HoldingLactuloseRespirationHydrogenRespiratory MechanicsCarbon DioxideCarbon IsotopesVolatile Organic CompoundsTidal VolumeLactose IntoleranceGastric EmptyingUreaMass SpectrometryHelicobacter pyloriHelicobacter InfectionsEthaneVolatilizationReproducibility of ResultsTandem Mass SpectrometryPulmonary VentilationTime FactorsAcetoneSensitivity and SpecificityLiquid VentilationChromatography, GasLactose Tolerance TestHalitosisInhalationPhenylmercury CompoundsCaprylatesCarbon RadioisotopesGastrointestinal TransitGas Chromatography-Mass SpectrometryPulmonary Gas ExchangeAminopyrineCarbon MonoxideSpectrometry, Mass, Electrospray IonizationPreservatives, PharmaceuticalLungRespiratory Function TestsRespiratory RateRespiratory Physiological PhenomenaDyspneaMethaneLung Volume MeasurementsGasesHemiterpenesHydrogen-Ion ConcentrationEthanolBiological MarkersSulfur CompoundsAirway ResistanceMalabsorption SyndromesPressureAnti-Ulcer AgentsAirRespiration, ArtificialAdministration, TopicalOxygenReference ValuesApneaDyspepsiaEquipment DesignAuscultationWaterSpectrophotometry, UltravioletTemperatureLactoseRespiratory SoundsHyperventilationOmeprazoleCross-Over StudiesAmoxicillinSolventsDrug StabilityAnti-Bacterial AgentsCalibrationReference StandardsAir PressureClarithromycinSolid Phase Extraction2-PyridinylmethylsulfinylbenzimidazolesAerosolsFecesChromatography, Reverse-PhaseForced Expiratory VolumeFunctional Residual CapacityViscosityModels, BiologicalBismuthProspective StudiesUrease