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Collins, R., Burch, J., Cranny, G., Aguiar-Ibáñez, R., Craig, D., Wright, K., Berry, E., Gough, M., Kleijnen, J., & Westwood, M. (2007). duplex ultrasonography, magnetic resonance angiography, and computed tomography angiography for diagnosis and assessment of symptomatic, lower limb peripheral arterial disease: systematic review. BMJ, 334(7606), 1257–. http://access.bl.uk/ark:/81055/vdc_100139914157.0x00004e