1. 1st Department of Urology, Aristotle University of Thessaloniki, “G. Gennimatas” General Hospital, Thessaloniki, Greece
2. Department of Surgery, Division of Urology, Tottori University Faculty of Medicine, Yonago, Japan
3. Department of Urology, University of Ioannina School of Medicine, Ioannina, Greece
4. Department of Urology, Martha-Maria Hospital, Nuremberg, Germany