1. Department of Urology, Düsseldorf University Hospital, 40591 Düsseldorf, Germany
2. Department of Urology, University Hospitals KULeuven, 3000 Leuven, Belgium
3. Department of Histopathology, University Hospitals KULeuven, 3000 Leuven, Belgium
4. Department of Radiology, University Hospitals KULeuven, 3000 Leuven, Belgium