CoughWhooping CoughAntitussive AgentsEpisode of CareCapsaicinCitric AcidCodeineRespiratory SoundsReflexExpectorantsChronic DiseaseBronchitisRecurrenceAsthmaRespiratory Tract InfectionsTime FactorsTreatment OutcomeProspective StudiesGastroesophageal RefluxRespiratory Tract DiseasesBordetella pertussisCommon ColdRespiration DisordersNasal DecongestantsSputumAcute DiseaseAdministration, InhalationBronchial Provocation TestsGuaifenesinForced Expiratory VolumeFeverRespiratory Function TestsRetrospective Studies