1. Department of Urology; OLV Ziekenhuis; Aalst Belgium
2. School of Medicine; Universidad Nacional Autónoma de México; Mexico City Mexico
3. Division of Oncology/Unit of Urology; URI; IRCCS Ospedale San Raffaele; Milan Italy
4. Department of Urology; Ospedali riuniti di Trieste; University of Trieste; Trieste Italy
5. American British Cowdray Medical Center; Mexico City Mexico