作者单位:Department of Pediatrics Hematology-Oncology, IRCSS Ospedale Pediatrico Bambino Gesù, Roma[1]SSD Ematologia-Clinica Sperimentale, Department of Pediatrics, University of Padova, Padova, Italy[2]Pediatric Hematology and Oncology, Fondazione IRCCS Policlinico 'San Matteo', Pavia, Italy[3]