1. Department of Pediatrics, Ospedale S. Gerardo, University of Milano-Bicocca, Fondazione MBBM, Monza, Italy;
2. Center of Biostatistics for Clinical Epidemiology, Department of Health Sciences, University of Milano-Bicocca, Milan, Italy;
3. Department of Pediatric Hemato-Oncology, Ospedale Pausilipon, Napoli, Italy;
4. Department of Woman and Child Health, Hemato-Oncology Division, University of Padova, Azienda Ospedale Padova, Padova, Italy;
5. Department of Pediatric Hemato-Oncology, IRCCS Ospedale Bambino Gesù, Roma, Italy;
6. University of Pavia, Pavia, Italy;
7. Department of Pediatric Hemato-Oncology, Regina Margherita Children’s Hospital, Torino, Italy;
8. Department of Pediatric Hemato-Oncology, Azienda Policlinico - OVE, Catania, Italy;
9. Department of Pediatric Hemato-Oncology, University of Bari, Bari, Italy;
10. Istituto Toscano Tumori, Firenze, Italy;
11. Department of Pediatric Hemato-Oncology, University of Palermo, Palermo, Italy;
12. Department of Pediatric Hemato-Oncology, University of Bologna, Bologna, Italy;
13. Department of Cellular Biotechnologies and Hematology, University La Sapienza, Roma, Italy;
14. Department of Pediatric Hemato-Oncology, IRCCS I.G. Gaslini, Genova, Italy;
15. Department of Pediatric Hemato-Oncology, University of Napoli, Napoli, Italy;
16. Department of Pediatric Hemato-Oncology, IRCCS Fondazione Policlinico San Matteo, Pavia, Italy;
17. Department of Pediatric Hemato-Oncology, University of Pisa, Pisa, Italy;
18. Department of Pediatric Hemato-Oncology, Institute for Maternal and Child Health, IRCCS Burlo Garofalo, Trieste, Italy;
19. Department of Pediatric Hemato-Oncology, Ospedale Civile, Pescara, Italy; and
20. Department of Pediatric Hemato-Oncology and Bone Marrow Transplant Unit, Spedali Civili, Brescia, Italy