Ben-David, Reuben, et al. “External Validation of a Simplified Prognostic Model for Survival in Patients With Extrinsic Malignant Ureteral Obstruction Treated With Tandem Ureteral Stents – a Retrospective Cohort Study”. Scandinavian Journal of Urology, vol. 57, no. 1-6, Nov. 2023, pp. 90-96, doi:10.1080/21681805.2023.2171113.