1. Department of Urology and Robotic Urology, Diakonie Klinikum Siegen, Academic Teaching Hospital, University of Bonn, 53127 Bonn, Germany
2. Department of Urology, Pediatric Urology and Andrology, Justus-Liebig University of Giessen, 35390 Giessen, Germany
3. Department of Epidemiology and Public Health, Faculty of Health Sciences, American University of Beirut, Beirut 2020, Lebanon