1. Institute of Pathology, University Medicine Rostock, Strempelstraße 14, 18055 Rostock, Germany
2. Institute of Pathology, University of Bonn, Germany
3. Martini Clinic, University Hospital Hamburg-Eppendorf, Germany
4. Department of Urology, Charité University Hospital Berlin and Berlin Institute for Urologic Research, Germany
5. Institute of Pathology, Stendal, Germany
6. Institute of Pathology, University of Heidelberg, Germany
7. Institute of Pathology, University Hospital Hamburg-Eppendorf, Germany