title: Chronic cough and sputum production: a clinical COPD phenotype?
authors: Pierre-Régis
authors: PR
authors: Burgel
mesh_terms: D029481:Bronchitis, Chronic / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications*