1. Department of Urology; Hanusch Krankenhaus; Vienna Austria
2. Department of Radiology; Hanusch Krankenhaus; Vienna Austria
3. Department of Radiology; Medical University Innsbruck; Innsbruck Austria
4. Department of Urology; Eberhard-Karls University; Tuebingen Germany
5. Department of Urology; Medical University Innsbruck; Innsbruck Austria