however comparison of a total of 20 sialograms obtained from patients with antibodies to ss-a ( ro ) showed more advanced changes than in a total of 36 sialograms from patients without antibodies to ss-a ( ro ) in systemic lupus erythematosus , mixed connective tissue disease , progressive systemic sclerosis and rheumatoid arthritis .
C0075128
antibodies
C0003241
antibodies