[Studies on malignant rheumatoid arthritis. 2. Clinical characteristics of malignant rheumatoid arthritis. Supplement--epidemiological survey conducted in the Kyushu area].
D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged