1. Department of Urology and Urosurgery, University Medical Center Mannheim, University of Heidelberg, Mannheim, Germany.
2. RaVeNNA 4pi–Consortium of the German Federal Ministry of Education and Research (BMBF), Mannheim, Germany.
3. Department of Urology, University of Freiburg–Medical Center, Faculty of Medicine, Freiburg, Germany.
4. Department of Urology and Pediatric Urology, University Medical Center Bonn, University of Bonn, Bonn, Germany.