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APA Citation
Perry, J. J., Stiell, I. G., Sivilotti, M. L. A., Bullard, M. J., Émond, M., Symington, C., Sutherland, J., Worster, A., Hohl, C., Lee, J. S., Eisenhauer, M. A., Mortensen, M., Mackey, D., Pauls, M., Lesiuk, H., & Wells, G. A. (2011). sensitivity of computed tomography performed within six hours of onset of headache for diagnosis of subarachnoid haemorrhage: prospective cohort study. BMJ, 343, . http://access.bl.uk/ark:/81055/vdc_100144729228.0x000024