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Gilbert, A., Francischetto, E. O., Blazeby, J., Holch, P., Davidson, S., Sebag-Montefiore, D., & Velikova, G. (n.d.). choice of a patient-reported outcome measure for patients with anal cancer for use in cancer clinical trials and routine clinical practice: a mixed methods approach. Lancet, 385, S38–. http://access.bl.uk/ark:/81055/vdc_100052040807.0x000001