A retrospective assessment of emergency department patients with complaint of headache.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004636:Emergency Service, Hospital; D005260:Female; D006261:Headache / Q000453:epidemiology* / Q000209:etiology; D006785:Hospitals, University; D006801:Humans; D008297:Male; D008875:Middle Aged; D010414:Pennsylvania; D012189:Retrospective Studies