title: [Etiology of malignant rheumatoid arthritis. (3) Its epidemiology and inflammation. (3-1) Rheumatoid factor and complement].
mesh_terms: D000328:Adult; D000368:Aged; D001172:Arthritis, Rheumatoid / Q000209:etiology / Q000276:immunology*; D003165:Complement System Proteins / Q000032:analysis*; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000032:analysis; D007075:Immunoglobulin M / Q000032:analysis; D008297:Male; D008875:Middle Aged; D012217:Rheumatoid Factor / Q000032:analysis*
chemical_list: D007074:Immunoglobulin G; D007075:Immunoglobulin M; D003165:Complement System Proteins; D012217:Rheumatoid Factor