1. Epidemiology and Biostatistics Unit IRCCS Istituto Giannina Gaslini Genova Italy
2. Oncology Unit IRCCS Istituto Giannina Gaslini Genova Italy
3. Department of Pediatrics, Hematology‐Oncology Unit University Hospital Catania Italy
4. Department of Hematology‐Oncology Anna Meyer Children's Hospital Firenze Italy
5. Pediatric Surgery Unit Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico Milano Italy
6. Laboratory of Experimental Therapy in Oncology IRCCS Istituto Giannina Gaslini Genova Italy