the patients were classified into 2 major groups : group i consisted of 24 patients with definite connective tissue disease -- 12 with scleroderma , including 8 with progressive systemic sclerosis ( pss ) , 6 with rheumatoid arthritis , 5 with systemic lupus erythematosus , and 1 with polymyositis ;
C0009782
connective tissue disease
C0036421
progressive