1. Section of Pediatric Hematology and Oncology, Azienda Ospedaliero-Universitaria Pisana, 56126 Pisa, Italy
2. Section of Clinical and Laboratory Immunology, Pediatric Unit, Department of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy
3. Section of Cytogenetics, Department of Laboratory Medicine, Azienda Ospedaliero-Universitaria Pisana, 56126 Pisa, Italy
4. Pediatrics Unit, Department of Clinical and Experimental Medicine, University of Pisa, 56126 Pisa, Italy