title: Natural course of rheumatoid arthritis.
mesh_terms: D000328:Adult; D000368:Aged; D001171:Arthritis, Juvenile / Q000453:epidemiology; D001172:Arthritis, Rheumatoid / Q000453:epidemiology* / Q000473:pathology / Q000628:therapy; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008910:Minnesota; D011159:Population Surveillance; D011379:Prognosis