1. Department of Urology and Pediatric UrologySaarland University Homburg Germany
2. Institute of Medical Biometry, Epidemiology and Medical InformaticsSaarland University Homburg Germany
3. Institute of Pathology, University Hospital Erlangen, Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany
4. Department of UrologyUniversity Hospital Erlangen, Friedrich‐Alexander‐University Erlangen‐Nuremberg Erlangen Germany