title: Polymyositis and related disorders.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009220:Myositis / Q000175:diagnosis* / Q000209:etiology / Q000628:therapy