1. Center for Minimally Invasive and Robotic Urology, Augusta Hospital Bochum, Witten/Herdecke University, Bergstraße 26, 44791 Bochum, Germany
2. Department of Urology, Pediatric Urology and Urologic Oncology, St. Antonius Hospital Gronau, Möllenweg 22, 48599 Gronau, Germany
3. Department of Urology, Saarland University, Kirrberger Str. 100, 66421 Homburg, Germany
4. Department of Urology, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany