1. Department of Urology, München-Harlaching Krankenhaus, München, Germany
2. Department of Urology, Institut Mutualiste Montsouris, Paris, France
3. Department of Urology, Caritas Krankenhaus, Regensburg, Germany
4. Department of Urology, Hôpital Saint-Louis, Paris, France
5. Department of Urology, University Medical Center St Radboud, Nijmegen, The Netherlands
6. Department of Urology, Hôpital Edouard Herriot, Lyon, France