title: Epidemiological studies on rheumatic diseases.
mesh_terms: D000328:Adult; D000368:Aged; D001130:Arizona; D001172:Arthritis, Rheumatoid / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007198:Indians, North American; D008297:Male; D008875:Middle Aged; D009009:Montana; D012216:Rheumatic Diseases / Q000453:epidemiology*; D012217:Rheumatoid Factor; D013167:Spondylitis, Ankylosing / Q000453:epidemiology
chemical_list: D012217:Rheumatoid Factor