1. Department of Urology and Urosurgery University Hospital Manheim MannheimGermany
2. Department of Urology University Hospital Göttingen GöttingenGermany
3. Urological Hospital Munich‐Planegg PlaneggGermany
4. Department of Urology University of Bonn BonnGermany
5. Department of Urology University of Ulm Ulm Germany