1. Division of Hematology and Clinical Immunology, Department of Medicine, University of Perugia, Perugia, Italy;
2. Hematology Section, Department of Life, Health and Environmental Sciences, University of L’Aquila, L’Aquila, Italy;
3. Blood Bank, Ospedale Santa Maria della Misericordia, Perugia, Italy;
4. Weizmann Institute of Science, Immunology Department, Rehovot, Israel; and
5. Hematology and Bone Marrow Transplant Unit, Department of Clinical and Experimental Medicine, University of Parma, Parma, Italy