The prevalence of rheumatoid arthritis in different geographical areas in Sweden.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001171:Arthritis, Juvenile / Q000453:epidemiology*; D001172:Arthritis, Rheumatoid / Q000453:epidemiology*; D002648:Child; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013548:Sweden