title: A study of immune status in rheumatoid arthritis.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000276:immunology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D012217:Rheumatoid Factor / Q000032:analysis*
chemical_list: D012217:Rheumatoid Factor