What is the quickest scoring system to predict percutaneous nephrolithotomy outcomes? A comparative study among STONE score, Guy's Stone Ccore and CROES nomogram - Vicentini, Fabio C.; Serzedello, Felipe R; Thomas, Kay; Marchini, Giovanni S; Torricelli, Fabio C. M; Srougi, Miguel; Mazzucchi, Eduardo (International braz j urol, 2017)