de Pinho, D. F. R., Ágata Areias, L. Calixto, M. Castanheira, and E. Amadeu. “POSSUM and P-POSSUM: Predictors for Radical Cystectomy Mortality and Morbidity Risk”. Journal of the Portuguese Society of Anesthesiology, vol. 25, no. 2, May 2016, pp. 54-59, doi:10.25751/rspa.6694.