1. Departments of Diagnostic and Interventional Radiology nd Urology (A.S.B., S.R.), HELIOS Medical Center Wuppertal, University Hospital Witten/Herdecke, Wuppertal, Germany;

2. Departments of Diagnostic and Interventional Radiology nd Urology HELIOS Medical Center Wuppertal, University Hospital Witten/Herdecke, Wuppertal, Germany;

3. Department of Radiology, Charité University Medicine, Berlin, Germany

4. Departments of Diagnostic and Interventional Radiology and Urology , HELIOS Medical Center Wuppertal, University Hospital Witten/Herdecke, Wuppertal, Germany