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Perry J J, Stiell I G, Sivilotti M L A, Bullard M J, Ãmond M, Symington C et al.
Sensitivity of computed tomography performed within six hours of onset of headache for diagnosis of subarachnoid haemorrhage: prospective cohort study
BMJ 2011; 343 :d4277
doi:10.1136/bmj.d4277