title: The frequency of hepatitis associated antigen (HAA) in sera of patients with rheumatoid arthritis.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000276:immunology*; D002205:Caplan Syndrome / Q000276:immunology; D005260:Female; D006386:Hemagglutination Tests; D006505:Hepatitis / Q000276:immunology; D006510:Hepatitis B Antibodies / Q000032:analysis; D006511:Hepatitis B Antigens / Q000032:analysis*; D006801:Humans; D005779:Immunodiffusion; D007841:Latex Fixation Tests; D008297:Male; D012217:Rheumatoid Factor / Q000032:analysis; D012859:Sjogren's Syndrome / Q000276:immunology
chemical_list: D006510:Hepatitis B Antibodies; D006511:Hepatitis B Antigens; D012217:Rheumatoid Factor