1 Paediatric Surgery, Ospedale Infantile Regina Margherita, Turin, Italy.
2 Department of Paediatric Surgery and Paediatric Urology, Children's Health Ireland at Temple Street and University College Dublin, Dublin, Ireland.
3 Paediatric Surgery Department, 'V. Buzzi' Children's Hospital, Milan, Italy.
4 Servicio de Cirugía Pediátrica, Hospital Materno-Infantil del HRU, Malaga, Spain.
5 Department of General Paediatric Surgery, Gregorio Marañón Hospital, Madrid, Spain.
6 Department of Paediatric Surgery, University of Hannover, Hannover, Germany.
7 Department of Paediatric Surgery, University Hospital in Leipzig, Leipzig, Germany.
8 Clinical Department of Pediatric Surgery and Urology with Center, Regional Specialized Children's Hospital, Olsztyn, Poland.
9 Department of Surgery and Urology for Children and Adolescents, Medical University of Gdansk, Gdansk, Poland.
10 Department of Paediatric and Adolescent Surgery, Medical University of Graz, Graz, Austria.
11 Department of Paediatric Surgery and Urology, Robert Debré Hospital, Assistance Publique-Hôpitaux de Paris, Paris, France.
12 Department of Paediatric Surgery, Oslo University Hospital and University of Oslo, Oslo, Norway.
13 Department of Paediatric Surgery, University of Helsinki, Helsinki, Finland.
14 Paediatric Surgery Department, Aristotle University of Thessaloniki, Thessaloniki, Greece.
15 Department of Paediatric Surgery, 'ATTIKON' University General Hospital, National and Kapodistrian University of Athens, School of Medicine, Athens, Greece.
16 Department of Paediatric Surgery Université Libre de Bruxelles, Queen Fabiola Children's Hospital, Brussels, Belgium.
17 Department of Paediatric Anaesthesia, Lapeyronie Hospital, Montpellier, France.