1. Pediatric Surgery, Department of Women's and Children's Health University Hospital of Padua Padua Italy
2. Department of Pediatrics, Clinical Hospital Center Rijeka University of Rijeka Rijeka Croatia
3. Pediatric Oncology Department Otto von Guericke University Children´s Hospital Magdeburg Germany
4. Clinic of Pediatrics Dortmund Municipal Hospital Dortmund Germany
5. Department of Hematology and Oncology, University Children's Hospital University of Belgrade Belgrade Serbia
6. Department of Pediatrics, Hematology and Oncology Medical University Gdansk Poland
7. Pediatric Hematology and Oncology Unit Hospital Universitario de Cruces Barakaldo‐Bizkaia Spain
8. Department of Pediatric Surgery Marciniak Hospital Wroclaw Poland
9. Department of Pediatric Traumatology and Emergency Medicine Medical University Wroclaw Poland
10. Department of Pediatrics, The Queen Silvia Children's Hospital University of Gothenburg Gothenburg Sweden
11. Gustave Roussy Cancer Center, Department of Children and Adolescents Oncology Paris‐Saclay University Villejuif France
12. Pediatric Oncology and Hematology University Children's Hospital Tuebingen Germany
13. Assistance Publique Hôpitaux de Paris (APHP), Department of Endocrinology and Diabetes for Children Bicêtre Paris‐Sud Le Kremlin Bicêtre Paris France
14. Paris‐Saclay University Paris‐Sud University Paris France
15. SIREDO Oncology Center (Care, Innovation and Research for Children, Adolescents and Young Adults with Cancer), Institut Curie PSL University Paris France
16. Pediatric Oncology Unit Fondazione IRCCS Istituto Nazionale dei Tumori di Milano Milan Italy
17. Hematology‐Oncology Division, Department of Women's and Children's Health University Hospital Padua Italy