1. Department of Urology, Autonomous University of Barcelona, Fundaciò Puigvert, Barcelona, Spain;
2. Department of Urology, Cottolengo Hospital, Torino, Italy;
3. Department of Urology, Medical University of Vienna, Vienna, Austria;
4. Department of Urology, Sindelfingen-Böblingen Medical Center, University of Tübingen, Sindelfingen, Germany;
5. Division of Endourology and Laparoscopy, Department of Urology and Urological Oncology, Hanover Medical School (MHH), Hanover, Germany;
6. Department of Surgery and Urology, Danderyd University Hospital, Stockholm, Sweden;
7. Department of Urology, Lillebaelt Hospital, University of Southern Denmark, Vejle, Denmark;
8. Department of Urology, University of Patras, Patras, Greece