1. Paediatric Oncology Royal Manchester Children's Hospital Manchester UK
2. Clinical Trials and Biostatistics Unit IRCCS Istituto Oncologico Veneto Padua Italy
3. SIREDO oncology centre Institut Curie Paris France
4. Department of Paediatric Hematology/Oncology of Hospital Vall d'Hebron Barcelona Spain
5. Department of Pediatrics CHC‐Clinique Esperance Montegnée Belgium
6. Princess Máxima Center for Pediatric Oncology Utrecht The Netherlands
7. Department of Diagnostic Paediatric Histopathology Royal Manchester Children's Hospital Manchester UK
8. Fondazione IRCCS Istituto Nazionale Tumori Milan Italy
9. Histopathology and Pediatric Pathology Unit Department of Diagnostic Pathology and Laboratory Medicine Fondazione IRCCS Istituto Nazionale dei Tumori Milan Italy
10. Fondazione Istituto di Ricerca Pediatrica Città della Speranza Padua Italy
11. Istituto di Anatomia Patologica Universitá di Padova Padua Italy