title: The rheumatoid factor among the population of south Bulgaria, among the diseased of rheumatiod arthritis and their relatives (an epidemiological study).
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000453:epidemiology* / Q000235:genetics; D002031:Bulgaria; D006386:Hemagglutination Tests; D006801:Humans; D008875:Middle Aged; D012217:Rheumatoid Factor / Q000032:analysis
chemical_list: D012217:Rheumatoid Factor