R I Lopes1,2, R Z Abdalla3,4, F T Dénes5,4. 1. Division of Urology, Hospital das Clinicas da Universidade de Sao Paulo, University of São Paulo School of Medicine, Avenida Dr. Eneas de Carvalho Aguiar, 255-Sala 710F, 7° Andar, São Paulo, SP, 05403-000, Brazil. roberto.iglesias@hc.fm.usp.br. 2. Hospital Sírio Libanês, São Paulo, Brazil. roberto.iglesias@hc.fm.usp.br. 3. Department of Gastroenterology, University of São Paulo School of Medicine, São Paulo, Brazil. 4. Hospital Sírio Libanês, São Paulo, Brazil. 5. Division of Urology, Hospital das Clinicas da Universidade de Sao Paulo, University of São Paulo School of Medicine, Avenida Dr. Eneas de Carvalho Aguiar, 255-Sala 710F, 7° Andar, São Paulo, SP, 05403-000, Brazil.