1. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Italy.
2. Rheumatology Unit, Department of Medical Sciences, Surgery and Neurosciences, University of Siena, Italy.
3. USL Toscana Centro, Firenze, Italy.
4. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Italy. 81clinda@gmail.com