1. Department of Pediatric Surgery; University of Caen Hospital; France
2. Department of Pediatric adolescent young adult Oncology; Institut Curie; Paris France
3. French very rare tumor pediatric tumor group, Fracture; France
4. Department of Pediatric Oncology; University of Bordeaux Hospital; France
5. Department of Pediatric Oncology; Hôpital d'Enfants Toulouse; France
6. Department of Pediatric Oncology; Hôpital Nord, St Etienne; France
7. Department of Pediatric Surgery; Hôpital Nord, St Etienne; France
8. Department of Pathology, Marie Lannelongue Surgical Center; Le Plessis Robinson; France
9. Department of Pediatric Oncology; Felix Guyon Hospital, St Denis; La Réunion France
10. Department Medical Oncology; Gustave Roussy; Villejuif France
11. Department of Pediatric Surgery; Hôpital Necker-Enfants-Malades, Assistance Publique Hôpitaux de Paris, Université Paris Descartes; Paris France