1. Department of Hematology, University of Siena, Azienda Ospedaliera Universitaria Senese, Siena, Italy
2. Department of Clinical and Experimental Medicine, U.O. Hematology, University of Pisa, Pisa, Italy
3. Functional Unit of Hematology, University of Florence, Florence, Italy
4. Department of Medicine and Aging, University of Chieti, Chieti, Italy
5. Hematology Unit, S. Eugenio Hospital, Tor Vergata University, Rome, Italy