1. Department of Oncohematology; Bambino Gesù Pediatric Hospital IRCCS; Rome Italy
2. Operative Unit of General and Thoracic Surgery-Surgery Regional Network; Bambino Gesù Pediatric Hospital IRCCS; Rome Italy
3. Azienda Regionale Ospedaliera San Carlo; Via Potito Petrone snc; Potenza Italy
4. Department of Hematology-Oncology; Giannina Gaslini Children's Hospital; Genoa Italy
5. Pediatric Oncology Unit; Department of Pediatrics; Second University of Naples; Naples Italy
6. Pediatric Hematology and Oncology Unit; G. Di Cristina Children's Hospital; A.R.N.A.S. Ospedale Civico; Palermo Italy
7. Department of Pathology; Bambino Gesù Pediatric Hospital IRCCS; Rome Italy
8. Pediatric Oncology Unit; Fondazione IRCCS Istituto Nazionale dei Tumori; Milano Italy
9. Operative Unit of General and Thoracic Surgery; Bambino Gesù Pediatric Hospital IRCCS; Rome Italy