1. Institute for Stem Cell Research and Regenerative Medicine University Hospital Düsseldorf Düsseldorf Germany
2. Institute of Pathology University Medical Center Goettingen Goettingen Germany
3. Department of Urology Urological Research Lab Translational UroOncology University Hospital Düsseldorf Düsseldorf Germany
4. Department of Pediatric Hematology and Oncology University Children's Hospital Essen Germany
5. Department of Pediatric Hematology and Oncology University Hospital Bonn Bonn Germany
6. Institute of Pathology University Hospital Bonn Bonn Germany
7. Department of Urology University Hospital Cologne Cologne Germany
8. Department of Urology University Hospital Düsseldorf Düsseldorf Germany