1. Division of Urology, School of Medicine University of Sao Paulo Sao Paulo Brazil
2. Department of Surgery State University of Feira de Santana Feira de Santana Bahia Brazil
3. Clinic of Urology, Military Hospital of Sao Paulo Area Sao Paulo Brazil
4. Department of Pathology and Laboratory Medicine Royal College of Physicians and Surgeons of Canada, Ottawa Hospital Research Institute, The Ottawa Hospital University of Ottawa Ottawa Canada