1. Department of Urology; Saarland University; Homburg/Saar Germany
2. Institute for Clinical and Experimental Surgery; Saarland University; Homburg/Saar Germany
3. Department of Diagnostic and Interventional Radiology; Saarland University Medical Center; Homburg/Saar Germany
4. Department of General and Surgical Pathology; Saarland University Medical Center; Homburg/Saar Germany