1. Department of Urology, Istanbul Faculty of Medicine, Istanbul University, 34452 Istanbul, Turkey
2. Department of Urology, Faculty of Medicine, Medical Center, University of Freiburg, 79106 Freiburg, Germany
3. European Association of Urology, Young Academic Urologist Endourology and Urolithiasis Working Party, NL-6803 Arnhem, The Netherlands
4. Department of Urology/Uro-Oncology, University College of London Hospitals (UCLH), London NW1 2BU, UK
5. Department of Urology, Fundacio Puigvert, Autonomous University of Barcelona, 08193 Barcelona, Spain
6. Department of Urology, AZ Klina, 2930 Brasschaat, Belgium
7. Department of Urology, University Hospital Zurich, University of Zurich, 8006 Zurich, Switzerland