1. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, Italy.
2. Division of Rheumatology, University and IRCCS Policlinico S. Matteo Foundation, Pavia, Italy.
3. Department of Experimental and Clinical Medicine, Rheumatology Unit, University of Florence, Italy.
4. Rheumatology Unit, Department of Medicine, University of Perugia, Italy.
5. Division of Rheumatology, University and IRCCS Policlinico S. Matteo Foundation, Pavia, Italy. lorenzo.cavagna@unipv.it
6. Rheumatology Unit, Department of Clinical and Experimental Medicine, University of Pisa, and Department of Internal Medicine, Ospedale Civile di Livorno, Italy.