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    Currie, C. J., Jones, M., Goodfellow, J., McEwan, P., Morgan, C. L., Emmas, C., & Peters, J. R. (2006). evaluation of survival and ischaemic and thromboembolic event rates in patients with non-valvar atrial fibrillation in the general population when treated and untreated with warfarin. Heart, 92(2), 196–200. http://access.bl.uk/ark:/81055/vdc_100137788668.0x000016