1. Department of Pediatric Surgery; Necker Enfants-Malades Hospital-Université Paris Descartes, Sorbonne Paris Cite; Paris France
2. Department of Pathology; Necker Enfants-Malades Hospital-Université Paris Descartes, Sorbonne Paris Cite; Paris France
3. Clinical Research Unit/Clinical Investigation Centre; Necker Enfants-Malades Hospital; Paris France
4. Department of Pediatrics, Adolescents, Young Adults, Institut Curie, Groupe Fracture; French Rare Pediatric Tumors Group; Paris France
5. Department of Hepato-Pancreato-Biliary Surgery, Pôle des Maladies de l'Appareil Digestif (PMAD); AP-HP, Hôpital Beaujon; Clichy France
6. Department of Surgical Oncology; Gustave Roussy Cancer Campus; Villejuif France
7. Department of Pediatric Surgery; Hôpitaux Universitaires Paris-Sud, Bicêtre Hospital, Université Paris XI, Le Kremlin-Bicêtre; France
8. Department of Pediatric Hematology-Oncology; Aix-Marseille Univ and APHM, Hôpital d' Enfants de La Timone; Marseille France
9. Department of Pediatrics; Institut Leon Bérard; Lyon France
10. Department of Pediatric Surgery; Hôpitaux Universitaires de Strasbourg; Strasbourg France
11. Department of Pediatric Surgery; CHR de la Citadelle; Liège Belgium
12. Department of Pediatric Surgery; Lapeyronie-Arnaud de Villeneuve Hospital; Montpellier France
13. Department of Pediatric Surgery, Children's Hospital Nancy-Brabois University Hospital; Vandoeuvre-lès-Nancy; France
14. Department of Pediatric Surgery; University Hospital; Angers France
15. Department of Pediatric Surgery; University Hospital; Besançon France
16. Department of Pediatric Surgery; University Hospital; Grenoble France
17. Department of Pediatric Surgery, Aix-Marseille Univ and APHM; Hôpital d'Enfants de La Timone; Marseille France