1. Pediatric Oncology Unit Fondazione IRCCS Istituto Nazionale dei Tumori di Milano Milan Italy
2. University Hospital of Cruces Barakaldo‐Bizkaia Spain
3. Pediatric Hematology‐Oncology Department Centre Hospitalier Universitaire Saint Denis de La Réunion France
4. University Medical Center Ljubljana Slovenia
5. Medical Oncology Unit IRCCS Foundation Ca' Granda Maggiore Hospital Policlinic Milan Italy
6. Pediatrics Clinic Dortmund Municipal Hospital Dortmund Germany
7. Department of Pediatric Surgery Marciniak Hospital Wroclaw Poland
8. Department of Pediatrics Hematology and Oncology, Medical University Gdansk Poland
9. Department of Dermatology University Hospital Tuebingen Tuebingen Germany
10. Department of Oncology St Jude Children's Research Hospital Memphis Tennessee USA
11. SIREDO Oncology Center (Care, Innovation and Research for Children, Adolescents and Young Adults with Cancer), Institut Curie, PSL University Paris France
12. Hematology‐Oncology Division, Department of Women's and Children's Health Padova University Hospital Padua Italy
13. Pediatric Hematology and Oncology, Children's Hospital Eberhard‐Karls‐University Tuebingen Germany