title: [Study on chronic bronchitis with special reference to rheumatoid factor].
mesh_terms: D000328:Adult; D000368:Aged; D001249:Asthma / Q000276:immunology; D001991:Bronchitis / Q000276:immunology* / Q000503:physiopathology; D002908:Chronic Disease; D006801:Humans; D008170:Lung Compliance; D008297:Male; D008875:Middle Aged; D011009:Pneumoconiosis / Q000276:immunology; D011859:Radiography; D012217:Rheumatoid Factor / Q000032:analysis*; D012507:Sarcoidosis / Q000000981:diagnostic imaging / Q000276:immunology; D013183:Sputum / Q000032:analysis; D014397:Tuberculosis, Pulmonary / Q000276:immunology; D014692:Ventilation-Perfusion Ratio
chemical_list: D012217:Rheumatoid Factor