1. Department of Pediatric Surgery, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy
2. Department of Pediatric Surgery, Hospital Gregorio Marañón, Madrid, Spain
3. Newborn Surgery Unit, Department of Medical and Surgical Neonatology, Research Institute, Bambino Gesù Children's Hospital, Rome, Italy
4. Department of Pediatric and Adolescent Surgery, Schneider Children's Medical Center, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
5. AIMAR-Italian Patients' and Parents' Organization for Anorectal Malformation, Rome, Italy
6. Pediatric Surgery Unit, Cà Foncello Hospital, Treviso, Italy
7. Department of Pediatric Surgery, Radboudumc Amalia Children's Hospital, Nijmegen, the Netherlands
8. Clinic for Paediatric Surgery and Paediatric Urology, Klinikum Bremen-Mitte, Bremen, Germany
9. Pediatric Surgery Unit, The Children Hospital, Azienda Ospedaliera SS Antonio e Biagio e Cesare Arrigo, Alessandria, Italy
10. Division of Paediatric Urology, Department of Urology, Radboudumc Amalia Children's Hospital, Nijmegen, the Netherlands
11. Pediatric Urology Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milano, Italy
12. Department of Pediatric Surgery, Erasmus MC Sophia Children's Hospital, Rotterdam, the Netherlands
13. Pediatric Surgery Unit, Department of Women's and Children's Health, University of Padua, Padua, Italy
14. Department of Pediatric Surgery, Rudnev Dnipropetrovsk Specialized Clinical Medical Center for Mother and Child Health, Dnipro, Ukraine
15. Pediatric Surgery Unit, University Hospital 12 de Octubre, Madrid, Spain
16. Department of Pediatric Surgery, Skane University Hospital, Lund University, Lund, Sweden