[Incidence of rheumatoid factors in the non-rheumatoid].
D000368:Aged; D001172:Arthritis, Rheumatoid / Q000097:blood; D006801:Humans; D007592:Joint Diseases / Q000097:blood; D012217:Rheumatoid Factor / Q000097:blood*; D012494:Sampling Studies
D012217:Rheumatoid Factor