title: A clinical, roentgenologic and biologic classification of patients with chronic obstructive lung disease.
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D001982:Bronchial Diseases / Q000145:classification; D005260:Female; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000145:classification* / Q000000981:diagnostic imaging / Q000473:pathology; D008297:Male; D008875:Middle Aged; D011656:Pulmonary Emphysema / Q000145:classification; D011859:Radiography; D012907:Smoking; D013997:Time Factors