1. Pediatric Oncology Unit Fondazione IRCCS Istituto Nazionale Tumori Milan Italy
2. Department of Pediatric Hematology and Oncology Fondazione IRCCS Policlinico San Matteo Pavia Italy
3. Pediatric Hematology and Oncology Unit, Hematology‐Oncology Department Santo Spirito Hospital Pescara Pescara Italy