1. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, and Department of Medical Biotechnologies, University of Siena, Italy.
2. Department of Experimental and Clinical Medicine, Division of Rheumatology, University of Florence, Italy.
3. Rheumatology Unit, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy.
4. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Italy.
5. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Italy. a.dellarossa@ao-pisa.toscana.it