DyspneaTracheal DiseasesFatal OutcomeLung Diseases, InterstitialTomography, X-Ray ComputedPulmonary Disease, Chronic ObstructiveRespiratory Function TestsSeverity of Illness IndexTreatment OutcomeForced Expiratory VolumeExercise ToleranceDyspnea, ParoxysmalQuality of LifeSymptom AssessmentDisease ProgressionQuestionnairesDepressionSpirometrySupranuclear Palsy, ProgressiveTime FactorsCoughFollow-Up StudiesProspective StudiesVital CapacityExercise TestLung Diseases, Obstructive