1. Department of Urology, University Hospital of Bern, 3010 Bern, Switzerland
2. Department of Urology, University Medical Center Rostock, 18055 Rostock, Germany
3. Department of Urology and Paediatric Urology, Uniklinik RWTH Aachen, 52074 Aachen, Germany
4. Department of Urology and Kidney Transplantation, Martin Luther University, 06120 Halle (Saale), Germany
5. Clinic for Urology, Pediatric Urology and Andrology, Justus-Liebig-University Giessen, 35390 Giessen, Germany
6. Institute of Clinical Medicine, University of Aarhus, 8200 Aarhus, Denmark
7. Department of Urology, Oslo University Hospital, 0315 Oslo, Norway
8. Institute of Clinical Medicine, University of Oslo, 0315 Oslo, Norway
9. Department of Urology, University of Szeged, 6725 Szeged, Hungary
10. Department of Urology, Hospital Universitario 12 de Octubre, 28041 Madrid, Spain
11. Department of Urology, Hospital Universitario Río Hortega, 47012 Valladolid, Spain
12. Department of Urology, University College London Hospitals, London W1G 8PH, UK