1. Department of Internal Medicine, University of Pisa School of Medicine, Pisa, Italy.
2. Rheumatology Unit, Department of Internal Medicine, School of Medicine, University of Modena and Reggio Emilia, Modena, Italy.
3. Department of Experimental Pathology and B.M.I.E., University of Pisa School of Medicine, Pisa, Italy.
4. Department of Experimental Medicine, Sapienza University of Rome, Rome, Italy.
5. Department of Surgery, University of Pisa, Pisa, Italy.