Early diagnosis of chronic obstructive pulmonary disease: pulmonary function tests versus x-ray examination of the chest.
D002908:Chronic Disease; D005260:Female; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000175:diagnosis* / Q000000981:diagnostic imaging; D008297:Male; D013902:Radiography, Thoracic; D012129:Respiratory Function Tests