title: Rheumatoid serum factor in populations in the U.K. I. Lung disease and rheumatoid serum factor.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000818:Animals; D001172:Arthritis, Rheumatoid / Q000453:epidemiology; D001991:Bronchitis / Q000453:epidemiology; D004739:England; D006386:Hemagglutination Tests; D006801:Humans; D008171:Lung Diseases / Q000000981:diagnostic imaging / Q000453:epidemiology / Q000276:immunology*; D008875:Middle Aged; D010995:Pleural Diseases / Q000453:epidemiology; D011859:Radiography; D012217:Rheumatoid Factor / Q000032:analysis*; D012424:Rural Population; D012756:Sheep; D012907:Smoking / Q000453:epidemiology; D014397:Tuberculosis, Pulmonary / Q000453:epidemiology; D014505:Urban Population; D014852:Wales
chemical_list: D012217:Rheumatoid Factor