1. Department of Pediatric Surgery, Ege University Faculty of Medicine, Izmir, Turkey
2. Department of Pediatric Surgery, University Hospital Leipzig, Leipzig, Germany
3. Department of Pediatric Surgery and Urology, Medical University of Silesia, Katowice, Silesia, Poland
4. Department of Pediatric Surgery, Navarre Hospital Complex, Pamplona, Navarre, Spain
5. Department of Pediatric Surgery, University of Pavia, Pavia, Italy
6. Department of Pediatric Surgery, University Medical Center of Johannes Gutenberg University Mainz, Mainz, Germany
7. Department of Pediatric Surgery, Chelsea and Westminster Hospital NHS Foundation Trust, London, United Kingdom of Great Britain and Northern Ireland