1. Pediatric Oncology Unit, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, Milano, Italy.
2. Evaluative Epidemiology Unit, Department of Research in Epidemiological and Molecular Medicine, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, Milano, Italy.
3. Hematology-Oncology Division, Department of Women's and Children's Health, Padova University Hospital, Padova, Italy.
4. Hematology/Oncology, Ospedale Pediatrico Bambino Gesù IRCCS, Roma, Italy.
5. AYA and Pediatric Radiotherapy Unit, Centro di Riferimento Oncologico, Aviano, Italy.
6. Pediatric Oncology Unit, Ospedale Vito Fazzi, Lecce, Italy.
7. Pediatric Onco-Hematology, Stem Cell Transplantation and Cellular Therapy Division, Regina Margherita Children's Hospital, Azienda Ospedaliera-Universitaria Città della Salute e della Scienza, Torino, Italy.