title: [Clinical and electromyographic studies on polymyositis-dermatomyositis].
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003882:Dermatomyositis / Q000175:diagnosis / Q000503:physiopathology*; D004576:Electromyography; D004594:Electrophysiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009220:Myositis / Q000175:diagnosis / Q000503:physiopathology*