1. Hematology and Bone Marrow Transplant Unit, Azienda Ospedaliera Papa Giovanni XXIII, Bergamo, Italy
2. Research Foundation, Azienda Ospedaliera Papa Giovanni XXIII, Bergamo, Italy
3. Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
4. Department of Hematology Oncology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy
5. Division of Hematology, Department of Medicine, Ospedale di Circolo e Fondazione Macchi, Varese, Italy