1. Pediatric Oncology and Hematology Unit “Lalla Seràgnoli”, Department of Pediatrics; University of Bologna Sant'Orsola-Malpighi Hospital; Bologna; Italy
2. Pediatric Oncology Unit, Department of Hematology and Pediatric Hemato-Oncology; Fondazione IRCCS Istituto Nazionale dei Tumori; Milan; Italy
3. Molecular Bases of Genetic Risk and Genetic Testing Unit, Department of Preventive and Predictive Medicine; Fondazione IRCCS Istituto Nazionale dei Tumori; Milan; Italy
4. Pediatric Surgery Unit, Department of Pediatric Surgery; University of Bologna, Sant'Orsola-Malpighi Hospital; Bologna; Italy
5. Department of Pathology and Laboratory Medicine; Fondazione IRCCS Istituto Nazionale dei Tumori; Milan; Italy