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Lung Diseases, ObstructivePulmonary Disease, Chronic ObstructiveSpirometryForced Expiratory VolumeRespiratory Function TestsLung DiseasesLungVital CapacityBronchodilator AgentsPulmonary EmphysemaAirway ObstructionDyspneaSmokingProtriptylineBronchitisVentilators, Negative-PressureSeverity of Illness IndexTotal Lung CapacityOxygen Inhalation TherapyPulmonary Heart DiseaseDoxapramMedroxyprogesteroneBronchiectasisLung Diseases, InterstitialLung, HyperlucentExhalationAlbuterolSputumAsthmaHypercapniaAirway ResistanceOxygenAdrenergic beta-2 Receptor AgonistsBlood Gas AnalysisRespiratory SystemExercise ToleranceCarbon DioxideBronchiSleep Apnea, ObstructiveSleepRespirationRisk FactorsChronic DiseaseQuality of LifeQuestionnairesCase-Control StudiesAdministration, InhalationPrevalenceHeliumCross-Sectional StudiesTime FactorsExercise TestTreatment OutcomeForced Expiratory Flow RatesBronchiolitis ObliteransFlavoring AgentsMucusIpratropiumDouble-Blind MethodRespiratory TherapyProspective StudiesCohort StudiesComorbidityTomography, X-Ray ComputedPractice Guidelines as TopicLung Volume MeasurementsAge FactorsCholinergic AntagonistsLung NeoplasmsBronchitis, ChronicRespiratory InsufficiencyRetrospective StudiesPrognosisalpha 1-Antitrypsin DeficiencyRespiratory MucosaCoal TarBiological MarkersCoughFood-Processing IndustryMaximal Expiratory Flow RatePredictive Value of TestsDeinstitutionalizationJaundice, ObstructiveAdrenal Cortex HormonesNebulizers and VaporizersPneumoniaFunctional Residual CapacityMucociliary ClearancePulmonary Gas ExchangeMultivariate AnalysisRespiration DisordersPulmonary VentilationCystic FibrosisIntermittent Positive-Pressure VentilationHeart-Lung TransplantationRespiratory MechanicsPositive-Pressure RespirationRespiration, ArtificialOccupational DiseasesLung Transplantation