[Clinical studies on overlap syndrome].
D001172:Arthritis, Rheumatoid / Q000150:complications; D003095:Collagen Diseases; D005069:Evaluation Studies as Topic; D006801:Humans; D008180:Lupus Erythematosus, Systemic / Q000150:complications*; D009220:Myositis / Q000150:complications; D010488:Polyarteritis Nodosa / Q000150:complications; D012213:Rheumatic Fever / Q000150:complications; D012595:Scleroderma, Systemic / Q000150:complications; D013577:Syndrome