1. Pediatric Oncology Unit Fondazione IRCCS Istituto Nazionale dei Tumori di Milano Milan Italy
2. Clinic of Pediatrics Dortmund Municipal Hospital Dortmund Germany
3. Hematology‐Oncology Division Department of Women's and Children's Health Padova University Hospital Padua Italy
4. Pediatric Hematology‐Oncology Department Centre Hospitalier Universitaire Saint Denis de La Réunion France
5. Department of Pediatric Surgery Marciniak Hospital Wroclaw Poland
6. Department of Pediatric Traumatology and Emergency Medicine Wroclaw Medical University Wroclaw Poland
7. Department of Pediatrics, Hematology and Oncology Medical University Gdansk Poland
8. Pediatric Surgery Department of Women's and Children's Health Padova University Hospital Padua Italy
9. Department of Pediatric Oncology Royal Manchester Children's Hospital Manchester UK
10. Department of Pediatrics Clinical Hospital Centre Rijeka Rijeka Croatia
11. Pediatric Hematology Unit Kaplan Medical Center Rehovot Israel
12. Pediatric Oncology Unit Hospital S. João Porto Portugal
13. SIREDO Oncology Center (Care Innovation and Research for Children Adolescents and Young Adults with Cancer) Institut Curie, PSL University Paris France
14. Pediatric Hematology and Oncology Children's Hospital, Eberhard‐Karls‐Universitaet Tuebingen Tuebingen Germany