title: Early diagnosis of chronic obstructive pulmonary disease.
mesh_terms: D000328:Adult; D000368:Aged; D001991:Bronchitis / Q000150:complications; D005260:Female; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000175:diagnosis* / Q000453:epidemiology / Q000209:etiology / Q000628:therapy; D008176:Lung Volume Measurements; D008297:Male; D008875:Middle Aged; D012907:Smoking; D013147:Spirometry; D013997:Time Factors; D014481:United States