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.