1. Department of Urology, St. Josef Medical Centre; University of Regensburg; Landshuter Str. 65 Regensburg 93053 Germany
2. Centre of Clinical Studies; University Medical Centre Regensburg; Regensburg Germany
3. Department of Urology, Mannheim Medical Centre; University of Heidelberg; Mannheim Germany
4. Department of Urology; Ulm University Medical Centre; Ulm Germany
5. Department of Urology; Central Hospital of Bolzano; Bolzano Italy
6. Medical School of Vienna; Sigmund Freud University; Vienna Austria
7. Department of Radiology; Central Hospital of Bolzano; Bolzano Italy
8. Department of Surgical Oncology (Urology); Netherlands Cancer Institute-Antoni van Leeuwenhoek Hospital; Amsterdam The Netherlands