CoughAntitussive AgentsRespiratory Tract InfectionsAcute DiseaseAnti-Bacterial AgentsPhysician's Practice PatternsNonprescription DrugsPrimary Health CareDrug PrescriptionsWhooping CoughGeneral PracticeEuropeFamily PracticeDecision MakingProspective StudiesRandomized Controlled Trials as TopicTreatment OutcomeCapsaicinCitric AcidCodeine