1. Department of Pediatric Surgery, Klinik St. Hedwig, University Medical Center Regensburg, Regensburg, Germany
2. Department of Pediatric Urulogy, Klinik St. Hedwig, University Medical Center Regensburg, Regensburg, Germany
3. Department of Radiology, Krankenhaus der Barmherzigen Brüder, Regensburg, Germany
4. Department of Rehabilitation Medicine and Orthopaedics, Klinikum Nürnberg, Nürnberg, Germany
5. Division of Clinical Epidemiology and Aging Research, German Cancer and Research Center Heidelberg, Germany
6. Department of Urology and Pediatric Urology, Ulm University, Ulm, Germany