1. Pediatric Onco-HematologyStem Cell Transplantation and Cellular Therapy Division, Regina Margherita Children's Hospital, Torino, Italy
2. Ospedale GallieraItalian Bone Marrow Donor Registry, Genova, Italy
3. Division of HematologySan Martino Hospital, Genova, Italy
4. Department of Clinical and Experimental MedicineSection of Hematology, University of Verona, Italy
5. Division of HematologyResearch Foundation, Ospedali Riuniti di Bergamo, Bergamo, Italy