Tzortzis, V., Dimitropoulos, K., Karatzas, A., Zachos, I., Stamoulis, K., Melekos, M., & Gravas, S. (2015). 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, 9(7-8), E500–4. https://doi.org/10.5489/cuaj.2063