Tzortzis, V., K. Dimitropoulos, A. Karatzas, I. Zachos, K. Stamoulis, M. Melekos, and S. Gravas. “Feasibility and Safety of Radical Cystectomy under Combined Spinal and Epidural Anesthesia in Octogenarian Patients With ASA Score ≥3: A Case Series”. Canadian Urological Association Journal, vol. 9, no. 7-8, July 2015, pp. E500-4, doi:10.5489/cuaj.2063.