1. Department of Urology, University of Münster, Münster, Germany
2. Department of Urology, University Medical Centre Mannheim, Mannheim, Germany
3. Department of Urology, University of Homburg, Homburg, Germany
4. Department of Urolog, University of Marburg, Marburg, Germany
5. Institute of Pathology, University of Marburg, Marburg, Germany
6. Department of Urology, University of Munich, Munich, Germany
7. Institute of Pathology, University of Erlangen, Erlangen, Germany
8. Department of Urology, University of Heidelberg, Heidelberg, Germany
9. Department of Urology, University of Erlangen, Erlangen, Germany
10. Department of Urology, Ruhr University Bochum, Marienhospital, Herne, Germany
11. Department of Urology, University of Mainz, Mainz, Germany
12. Department of Urology, University of Regensburg, Regensburg, Germany
13. Department of Medical Informatics and Biomathematics, University of Münster, Münster, Germany