title: Rheumatoid arthritis: clinical onset, seropositivity, and a possible cause.
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000175:diagnosis / Q000276:immunology*; D005260:Female; D006801:Humans; D007841:Latex Fixation Tests; D008297:Male; D008875:Middle Aged; D012217:Rheumatoid Factor / Q000032:analysis*; D013997:Time Factors
chemical_list: D012217:Rheumatoid Factor