1. Urology Institute of Piracicaba (IUP), Piracicaba, SP, Brazil.
2. Division of Urology, School of Medicine, State University of Campinas (UNICAMP), Campinas, SP, Brazil.
3. General Surgery and Laparoscopy, Piracicaba, SP, Brazil.
4. State University of Campinas (UNICAMP), Campinas SP, Brazil.