class-specific rheumatoid factors ( rfs ) were measured by enzyme immunoassay in 59 patients with rheumatoid arthritis complicated by systemic amyloidosis ( ra+a ) , 47 patients with rheumatoid arthritis without amyloid ( ra ) , 106 patients with other rheumatic diseases ( juvenile rheumatoid arthritis , systemic lupus erythematosus , sjogren 's syndrome ) , and 55 blood donors .
C0003873
rheumatoid arthritis
C1527336
sjogren 's syndrome