BronchitisPulmonary EmphysemaEmphysemaBronchitis, ChronicInfectious bronchitis virusSubcutaneous EmphysemaMediastinal EmphysemaLungPulmonary Disease, Chronic Obstructivealpha 1-Antitrypsin DeficiencyPancreatic ElastaseRespiratory Function TestsSmokingForced Expiratory VolumeChronic DiseaseCoronaviridaeCoronavirus InfectionsSmokePulmonary Heart DiseasePneumonectomyVital CapacityTomography, X-Ray ComputedSpirometryAirway ObstructionRespiratory Tract Diseasesalpha 1-AntitrypsinLung Diseases, ObstructiveCoughSputumMatrix Metalloproteinase 12Lung Volume MeasurementsTotal Lung CapacityPulmonary AlveoliAsthmaCoal MiningBronchoscopyHeliumLung DiseasesBronchiBronchoalveolar Lavage FluidPneumoconiosisPoultry DiseasesExpectorantsBronchiectasisPulmonary Diffusing CapacityResidual VolumeRespiratory Tract InfectionsDyspneaPneumoniaPulmonary FibrosisDustRadiography, ThoracicElastinAcute DiseaseRespiratory SoundsOccupational DiseasesSeverity of Illness IndexNasopharyngitisRespiration DisordersBronchographyBronchodilator AgentsCoronaviridae InfectionsLung ComplianceAirway ResistanceIpratropiumFossil FuelsLeukocyte ElastaseTobacco Smoke PollutionRespiratory MechanicsPrevalenceOccupational ExposureMucusChickensTextile IndustryBronchial DiseasesRespiratory MucosaTracheaCefuroximeTachypneaRisk FactorsByssinosisAerosolsMucociliary ClearanceAlbuterolDisease Models, AnimalOxygen Inhalation TherapyAtropine DerivativesWeldingDiaphragmBronchiolitisAnti-Bacterial AgentsPhenotypeRadiographic Image Interpretation, Computer-AssistedEosinophiliaPneumopericardiumPulmonary VentilationDesmosineTracheitisMass Chest X-RayPulmonary Atelectasis