1. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Italy. dinazucchi@hotmail.it
2. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Italy.
3. Rheumatology Unit, Department of Medical Sciences, University of Ferrara and Azienda Ospedaliero-Universitaria S. Anna, Ferrara, Italy.