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Pulmonary Disease, Chronic ObstructiveForced Expiratory VolumeSpirometryBronchodilator AgentsLung Diseases, ObstructiveDyspneaRespiratory Function TestsVital CapacityScopolamine DerivativesSmokingSeverity of Illness IndexLungExercise TolerancePulmonary EmphysemaAdministration, InhalationCholinergic AntagonistsPulmonary MedicinePrevalenceSputumTime FactorsTreatment OutcomeRespiratory System AgentsAdrenergic beta-2 Receptor AgonistsQuestionnairesMitotic IndexQuality of LifeForm PerceptionBronchitis, ChronicOxygen Inhalation TherapyAlbuterolAdrenal Cortex HormonesAsthmaMedical IllustrationCase-Control StudiesRisk FactorsInspiratory CapacityEmphysemaHospitalizationRespiratory MusclesProspective StudiesAge FactorsRetrospective StudiesCross-Sectional StudiesIncidenceEnglandOptical IllusionsExhalationRespiratory TherapyDisease ProgressionReproducibility of ResultsCohort StudiesSpainExpectorantsNetherlandsFollow-Up StudiesMetered Dose InhalersNebulizers and VaporizersSwedenIpratropiumBronchiRespiratory InsufficiencyExercise TestAge DistributionComorbiditySmokeSex FactorsEthanolaminesSex DistributionMitosisNorwayBiological MarkersPattern Recognition, VisualPrognosisRisk Assessmentalpha 1-Antitrypsin DeficiencyPhosphodiesterase 4 InhibitorsBronchitisSmoking CessationHealth Care CostsPublicationsAnalysis of VarianceIndansBreathing ExercisesSensitivity and SpecificityPhotic StimulationTotal Lung CapacityPredictive Value of TestsDouble-Blind MethodVisual PerceptionFinlandGlycopyrrolateWalkingQuadriceps MuscleComputer GraphicsCost of IllnessUnited StatesHealth StatusAirway ObstructionEuropeAirway Remodeling