title: Letter: Polymyositis and dermatomyositis.
mesh_terms: D001706:Biopsy; D003882:Dermatomyositis / Q000175:diagnosis* / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009132:Muscles / Q000473:pathology; D009220:Myositis / Q000175:diagnosis* / Q000473:pathology