Geographical studies on rheumatoid arthritis.
D000293:Adolescent; D000328:Adult; D001741:Black or African American; D000368:Aged; D000372:Agglutination Tests; D001172:Arthritis, Rheumatoid / Q000453:epidemiology*; D044383:Black People; D004813:Epidemiology; D005060:Europe; D005260:Female; D005843:Geography; D006801:Humans; D007198:Indians, North American; D007563:Jamaica; D008297:Male; D008875:Middle Aged; D009656:North America; D011859:Radiography; D044465:White People