Single-use flexible ureteroscopes: update and perspective in developing countries. A narrative review - Mazzucchi, Eduardo; Marchini, Giovanni Scala; Berto, Fernanda Christina Gabrigna; Denstedt, John; Danilovic, Alexandre; Vicentini, Fabio Carvalho; Torricelli, Fabio Cesar Miranda; Battagello, Carlos Alfredo; Srougi, Miguel; Nahas, Willian Carlos (International braz j urol, 2022)