the functional affinity of igm rheumatoid factors ( rf ) was measured in 31 patients with rheumatoid arthritis ( ra ) , 24 with systemic lupus erythematosus ( sle ) , 13 with sjogren 's syndrome ( ss ) , and in 13 seropositive healthy individuals .
C0003873
rheumatoid arthritis
C1527336
sjogren 's syndrome