1. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Italy.
2. University of Pavia and IRCCS Policlinico San Matteo Foundation, Pavia, Italy.
3. USL Toscana Centro, Firenze, Italy.
4. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Italy. 81clinda@gmail.com