Roberts, S., Roberts, S. E., Williams, J. G., Yeates, D., Goldacre, M. J., & Williams, J. (2007). Mortality in patients with and without colectomy admitted to hospital for ulcerative colitis and Crohn's disease: Record linkage studies. BMJ, 335(7628), p. 1033. doi:10.1136/bmj.39345.714039.55

Roberts, Stephen, S. E. Roberts, J. G. Williams, D. Yeates, M. J. Goldacre, and John Williams. "Mortality in Patients With and Without Colectomy Admitted to Hospital for Ulcerative Colitis and Crohn's Disease: Record Linkage Studies." BMJ 335, no. 7628 (2007): 1033.

Roberts, Stephen, et al. "Mortality in Patients With and Without Colectomy Admitted to Hospital for Ulcerative Colitis and Crohn's Disease: Record Linkage Studies." BMJ 335.7628 (2007): 1033.