1. Haematology Unit; Department of Experimental and Clinical Medicine; University of Florence; Florence; Italy
2. Department of General Surgery; University of Siena; Siena; Italy
3. Department of Medical, Surgical Sciences and Neuroscience; University of Siena; Siena; Italy
4. Department of Molecular and Developmental Medicine; University of Siena; Siena; Italy
5. Cord Blood Bank; Careggi University Hospital; Florence; Italy