1. 1st Department of Urology, Aristotle University of Thessaloniki, School of Medicine, Thessaloniki, Greece
2. Division of Urology, Department of Surgery, Tottori University Faculty of Medicine, 36-1 Nishimachi, Yonago, 683-8503, Japan
3. Department of Urology, University of Ioannina School of Medicine, P. O. Box 1186 45110, Ioannina, Greece
4. Department of Urology, "Martha-Maria" Hospital of Nuremberg, Nuremberg, Germany
5. Department of Urology, East Avenue Medical Center, Diliman, Quezon City, Philippines