mixed connective tissue diseases

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mixed connective tissue diseases; overlap syndromes simultaneous presentation of two or more autoimmune rheumatological diseases, e.g. autoimmune disease characterized by features of both rheumatoid arthritis (RA) and systemic lupus erythematosus (SL), or RA, SLE and SjÖgren's syndrome or polymyositis with scleroderma/systemic sclerosis and/or SLE