1. 2nd University Department of Urology, Sismanoglio Hospital, National and Kapodistrian University of Athens, Athens, Greece
2. Department of Urology, University College of London Hospitals (UCLH), London, UK
3. Department of Urology, Haukeland University Hospital, Bergen, Norway
4. Department of Clinical Medicine, University of Bergen, Bergen, Norway
5. Department of Urology, University Hospital Southampton, Southampton, UK