1. Pediatric Oncology and Hematology, Children's Hospital Vall d'HebronBarcelona Spain
2. Padova University HospitalPadova Italy
3. Pediatric Oncology, SIREDO Oncology Center, Institute CurieParis Sciences and Letters UniversityParis France
4. IHOPE/Center Leon BerardLyon France
5. Institute of Cancer ResearchLondon United Kingdom
6. Pediatric Research Institute Citta della SperanzaPadova Italy
7. Clinical Trials and Biostatistics Unit, Veneto Oncologic Institute IOV‐IRCCSPadova Italy
8. The Royal Marsden National Health Service Foundation TrustSutton United Kingdom
9. National Tumor InstituteMilan Italy
10. Pediatric Oncology, Children Hospital for Wales Cardiff and Vale University Health BoardCardiff United Kingdom
11. University Hospitals Bristol National Health Service Foundation TrustBristol United Kingdom
12. Pediatric Oncology, Emma Children's Hospital‐Academic Medical CenterAmsterdam The Netherlands
13. Pediatric Oncology, University Children's Hospital BrnoBrno Czech Republic
14. Pediatric Oncology, Oslo University HospitalOslo Norway
15. Pediatric Oncology, Children's Hospital Bambino Gesu, IRCCSRome Italy
16. Pediatric Oncology, National Cancer InstituteRio de Janeiro RJ Brazil