1. Second Department of Urology, Sismanoglio Hospital, National and Kapodistrian University of Athens, 15126 Athens, Greece
2. Department of Urology, General Hospital of Athens “G. Gennimatas”, 11527 Athens, Greece
3. Department of Urology, Red Cross General Hospital of Athens, 11526 Athens, Greece
4. School of Science and Technology, Hellenic Open University, 26335 Patras, Greece
5. Department of Urology, Haukeland University Hospital, 5009 Bergen, Norway
6. Department of Urology, University Hospital, Southampton SO16 6YD, UK