title: Positive computed tomography rate for lone acute severe headache:  a potential quality marker for emergency care?
authors: Mohammad Ali
authors: MA
authors: Husainy
authors: Farhina
authors: F
authors: Sayyed
authors: Abhishek
authors: A
authors: Vyas
authors: Kashif
authors: K
authors: Ahmed
authors: Avinash
authors: A
authors: Tiwari
authors: Sandeep
authors: S
authors: Tiwari
authors: Timothy J
authors: TJ
authors: Coats
mesh_terms: D000208:Acute Disease; D000328:Adult; D015331:Cohort Studies; D004635:Emergency Medicine / Q000379:methods* / Q000592:standards; D004636:Emergency Service, Hospital; D004638:Emergency Treatment / Q000379:methods; D005260:Female; D006261:Headache / Q000175:diagnosis / Q000000981:diagnostic imaging* / Q000628:therapy; D006801:Humans; D008297:Male; D008875:Middle Aged; D019984:Quality Indicators, Health Care; D012189:Retrospective Studies; D012720:Severity of Illness Index; D014057:Tomography, X-Ray Computed / Q000379:methods* / Q000706:statistics & numerical data; D006113:United Kingdom; D055815:Young Adult