1. SIREDO Oncology Center (Care, Innovation and Research for Children, Adolescents and Young Adults with Cancer) Institut Curie PSL University Paris France
2. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
3. Division Cancer and Imaging University Medical Center Utrecht Utrecht The Netherlands
4. Paediatric Oncology Royal Manchester Children's Hospital Manchester UK
5. Department of Pediatric Hematology and Oncology‐IHOPe Léon Bérard center Lyon France
6. Pathology Department Ospedale Pediatrico Bambino Gesù IRCCS Roma Italy
7. Ruth Rappaport Children's Hospital Haifa Israel
8. Department of Pediatric and Adolescent Oncology Gustave‐Roussy, Cancer Campus Université Paris‐Saclay Villejuif France
9. Haematology Oncology Division Department of Women's and Children's Health Padova University Hospital Padova Italy
10. Department of Pediatrics and Adolescent Medicine Rigshospitalet University of Copenhagen Copenhagen Denmark
11. Pediatric Surgery Women and Children's Health Department University Hospital of Padua Padua Italy
12. Pediatric Oncology and Hematology Pediatric Hospital Virgen del Rocío Sevilla Spain
13. Pediatric Oncology Unit Fondazione IRCCS Istituto Nazionale Tumori Milano Italy