BronchitisBronchitis, ChronicAirway ObstructionInfectious bronchitis virusLung Diseases, ObstructiveChronic DiseaseAirway ResistanceIntestinal ObstructionForced Expiratory VolumeAsthmaRespiratory Function TestsSpirometryVital CapacityBronchiSputumPulmonary EmphysemaPulmonary Disease, Chronic ObstructiveRespiratory Tract DiseasesCoughUreteral ObstructionEmphysemaSmokingLungPulmonary Heart DiseaseExpectorantsLaryngeal DiseasesAirway RemodelingBronchodilator AgentsBronchoscopyTracheal StenosisIpratropiumAtropine DerivativesMucusRespiratory SystemForced Expiratory Flow RatesDustBronchial HyperreactivityBronchial DiseasesBronchiectasisAlbuterolNasal ObstructionLung DiseasesBronchial Provocation TestsRespiratory SoundsCoronaviridaeRespiration DisordersCoronavirus InfectionsPulmonary VentilationAcute DiseaseOccupational DiseasesTextile IndustryPeak Expiratory Flow RateRespiratory MucosaMaximal Expiratory Flow RateMucociliary ClearanceBronchoalveolar Lavage FluidFossil FuelsDyspneaPierre Robin SyndromeRespiratory MechanicsRespiratory Tract InfectionsDuodenal ObstructionByssinosisCoal MiningPlethysmography, Whole BodyMaximal Expiratory Flow-Volume CurvesAerosolsAdministration, InhalationOccupational ExposurePneumoconiosisCefuroximeWeldingBronchoconstrictionUrinary Bladder Neck ObstructionAgricultural Workers' DiseasesUrethral ObstructionTracheal DiseasesMethacholine ChloridePrevalenceGastric Outlet ObstructionLung Volume MeasurementsPneumoniaTracheaHaemophilus influenzaeTotal Lung CapacityMass Chest X-RayRespirationVentricular Outflow ObstructionTracheotomyLaryngostenosisResidual VolumeAir Pollutants, OccupationalOropharynxRespiratory HypersensitivityIntubation, IntratrachealHeliumEosinophilsWaste ProductsPoultry DiseasesTreatment Outcome