1. Department of Hematology-Oncology; Istituto Giannina Gaslini; Genova Italy
2. Department of Oncology; AORN Santobono-Pausilipon; Napoli Italy
3. Epidemiology and Biostatistics Section; Istituto Giannina Gaslini; Genova Italy
4. Department of Hematology-Oncology; Ospedale Pediatrico Bambino Gesù; Roma Italy
5. Department of Onco-Hematology; Ospedale Pediatrico Regina Margherita; Torino Italy
6. Department of Pediatric Oncology; Fondazione IRCCS Istituto Nazionale dei Tumori; Milano Italy
7. Division of Pediatric Oncology; Università Cattolica di Roma-Ospedale A. Gemelli; Roma Italy
8. Division of Pediatric Oncology; Università di Padova; Padova Italy
9. Pediatric Oncology Unit; Department of Pediatrics; II Università di Napoli; Napoli Italy
10. Division of Pediatric Oncology; Azienda Ospedaliero-Universitaria di Modena; Modena Italy
11. Pediatric Oncology Unit; Ospedale Pediatrico Meyer; Firenze Italy
12. Service of Pediatric Neuroradiology; Istituto Giannina Gaslini; Genova Italy