title: [Prevalence of positive rheumatoid factor and results of a follow-up study in a population of 20,000].
mesh_terms: D000328:Adult; D000375:Aging / Q000276:immunology; D001172:Arthritis, Rheumatoid / Q000453:epidemiology* / Q000276:immunology; D003430:Cross-Sectional Studies; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D012217:Rheumatoid Factor / Q000032:analysis*
chemical_list: D012217:Rheumatoid Factor