1. Pediatric Oncology Unit; Fondazione IRCCS Istituto Nazionale Tumori; Milano Italy
2. Pediatric Hemathology and Oncology Division; Padova University Hospital; Padova Italy
3. Department of Pediatric Hematology/Oncology; Giannina Gaslini Children's Hospital; Genova Italy
4. Pediatric Oncology Unit; G. Di Cristina Children's Hospital; Palermo Italy
5. Department of Hematology/Oncology; Ospedale Pediatrico Bambino Gesù IRCCS; Roma Italy
6. Pediatric Surgery Unit; Padova University Hospital; Padova Italy
7. Pathology Department; Padova University Hospital; Padova Italy
8. Division of Pediatric Oncology; Catholic University of Roma; Roma Italy
9. Pediatric Oncology Service; Department of Pediatrics Second University; Napoli Italy