Tufano, A.; Frisenda, M.; Rossi, A.; Viscuso, P.; Mantica, G.; Bove, P.; Leonardi, R.; Calarco, A. External Validation of Resorlu-Unsal Stone Score in Predicting Outcomes After Retrograde Intrarenal Surgery. Experience from a Single Institution. Arch Ital Urol Androl 2022, 94, 311-314.