we now know that other connective tissue diseases ( e.g. , systemic lupus erythematosus , progressive systemic sclerosis , and polymyositis ) may be present in place of rheumatoid arthritis , and that the sicca complex can exist as a primary pathologic entity with no associated disorder ( strand and talal , 1980 ; talal , 1985 ) .
C0009782
connective tissue diseases
C0036421
progressive systemic sclerosis