1. Departments of Urology and Pediatric Urology, Krankenhaus Nordwest, Stiftung Hospital zum Heiligen Geist, Frankfurt am Main, Germany.
2. Second Department of Urology, Sismanoglio Hospital, University of Athens, Athens, Greece.
3. Radiological Institute, Krankenhaus Nordwest, Stiftung Hospital zum Heiligen Geist, Frankfurt am Main, Germany.