title: Clinical types of chronic obstructive pulmonary disease.
authors.forename: T L
authors.initials: TL
authors.lastname: Petty
mesh_terms: D000368:Aged; D003550:Cystic Fibrosis / Q000145:classification; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000145:classification* / Q000503:physiopathology; D008875:Middle Aged