1. Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, Milan, Italy.
2. Pediatric Onco-Hematology, Stem Cell Transplantation and Cellular Therapy Division, Azienda Ospedaliera-Universitaria Città della Salute e della Scienza, Regina Margherita Children's Hospital, Torino, Italy.
3. AYA and Pediatric Radiotherapy Unit, Centro di Riferimento Oncologico, Aviano, Italy.
4. Hematology/Oncology, Ospedale Pediatrico Bambino Gesù IRCCS, Roma, Italy.
5. Pediatric Oncology Unit, Ospedale Vito Fazzi, Lecce, Italy.
6. Department of Pediatrics, University of Milano-Bicocca, Fondazione MBBM/Ospedale San Gerardo, Monza, Italy.
7. Hematology-Oncology Division, Department of Women's and Children's Health, Padova University Hospital, Padova, Italy.
8. Centro Operativo AIEOP, Bologna, Italy.
9. Childhood Cancer Registry of Piedmont, Department of Medical Sciences, University of Torino, CPO-Piemonte, AOU Città della Salute e della Scienza di Torino, Torino, Italy.
10. Unit of Cancer Epidemiology, Department of Medical Sciences, University of Torino, Torino, Italy.
11. Department of Pediatric Hematology/Oncology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy.
12. Hematology-Oncology Unit, Department of Pediatrics, University of Bologna, Bologna, Italy.