1. Department of Paediatric Surgery, University of Leipzig, Leipzig , Germany
2. University Surgery Unit, Faculty of Medicine, University of Southampton , Southampton , UK
3. Servicio de Cirugía Pediátrica, Hospital Materno-Infantil del HRU de Málaga, Málaga, Spain
4. Department of General Paediatric Surgery, Gregorio Marañón Hospital , Madrid , Spain
5. Department of Paediatric Surgery, Hannover Medical School , Hannover , Germany
6. Department of Paediatric Surgery, University of Helsinki , Helsinki , Finland
7. Pediatric Surgery Unit, Oxford Children’s Hospital and University of Oxford , Oxford , UK
8. Department of Paediatric Surgery and Urology, Necke-Enfants Malades Hospital, Assistance Publique-Hôpitaux de Paris , Paris , France
9. Department of Paediatric Surgery and Urology, Robert Debré Hospital, Assistance Publique-Hôpitaux de Paris, Paris Cité University , Paris , France
10. Paediatric Surgery Department, Aristotle University of Thessaloniki , Thessaloniki , Greece
11. Department of Paediatric Surgery, ‘Attikon’ University General Hospital, National and Kapodistrian University of Athens, School of Medicine , Athens , Greece
12. Pediatric Surgery Unit, Medical Centre of Postgraduate Education , Warsaw , Poland
13. Paediatric Surgery and Urology Department, Wroclaw University of Medicine , Wroclaw , Poland
14. Paediatric Surgery Department, Regina Margherita Hospital , Turin , Italy
15. Paediatric Surgery Department, ‘V. Buzzi’ Children’s Hospital and University of Milan , Milan , Italy
16. Department of Paediatric Surgery, Skåne University Hospital , Lund , Sweden
17. Department of Paediatric Surgery, Karolinska University Hospital , Stockholm , Sweden
18. Department of Paediatric Surgery, Oslo University Hospital and University of Oslo , Oslo , Norway
19. University Centre of Paediatric Surgery of Western Switzerland, Division of Child and Adolescent Surgery, Department of Paediatrics, Gynaecology, and Obstetrics, University of Geneva, Geneva University Hospitals , Geneva , Switzerland
20. Division of Paediatric Urology, Department of Paediatric Surgery, Istanbul University Cerrahpasa Faculty of Medicine , Istanbul , Turkey
21. Department of Paediatric Surgery, Hospital de Braga , Braga , Portugal
22. Paediatric Surgical Centre of Amsterdam, Emma Children’s Hospital and VU University Medical Centre, Amsterdam UMC, University of Amsterdam , Amsterdam , the Netherlands
23. Department of Paediatric Surgery, Université Libre de Bruxelles (ULB), Queen Fabiola Children’s Hospital , Brussels , Belgium
24. Pediatric Surgery Unit, Children’s Hospital, Affiliate of Vilnius University Hospital Santaros Klinikos , Vilnius , Lithuania
25. Department of Paediatric and Adolescent Surgery, Medical University of Graz , Graz , Austria
26. Department of Paediatric Surgery, Charles University and Motol University Hospital , Prague , Czech Republic
27. Department of Paediatric Surgery, University Hospital of Split , Split , Croatia
28. Department of Surgery, University of Split, School of Medicine , Split , Croatia
29. Department of Paediatric Surgery, Grigore Alexandrescu Clinical Emergency Hospital for Children , Bucharest , Romania
30. Department of Paediatric Surgery and Orthopaedics, ‘Carol Davila’ University of Medicine and Pharmacy , Bucharest , Romania
31. Department of Paediatric Surgery and Paediatric Urology, Children’s Health Ireland at Temple Street and University College Dublin , Dublin , Ireland
32. Division of General and Thoracic Surgery, Hospital for Sick Children , Toronto, Ontario , Canada
33. Department of Surgery, University of Toronto , Toronto, Ontario , Canada
34. Department of Surgery, St Jude Children’s Research Hospital , Memphis, Tennessee , USA