Promedon GmbH, Kolbermoor, Germany;3. Department of Neurourology, University Hospital Bonn, Bonn, Germany;4. Department of Urology, Helios Klinikum Duisburg, Duisburg, Germany;5. Department of Urology, Diakonie Klinikum Schwaebisch Hall, Schwaebisch Hall, Germany;6. Department of Urology, Marienhaus klinikum Bendorf – Neuwied – Waldbreitbach, Germany;7. Department of Urology, University Hospital Muenster, Muenster, Germany;8. Department of Urology, University Hospital Heidelberg, Heidelberg, Germany;9. Department of Urology, St. Barbara Hospital Hamm, Hamm, Germany;10. Department of Urology, University Hospital Freiburg, Freiburg, Germany;11. Department of Urology, Vivantes Klinikum Am Urban, Berlin, Germany;12. Department of Urology, Landesklinikum Korneuburg, Korneuburg, Austria;13. Department of Urology, University Medical Center Mainz, Mainz, Germany;14. Department of Urology, University Hospital Munich Grosshadern (LMU), Munich, Germany