1. Division of Rheumatology, Univesity of Pavia and IRCCS Policlinico S. Matteo Foundation, Pavia, Italy.
2. Rheumatology Unit, University of Pisa, 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. Rheumatology Unit, Maggiore Hospital AUSL, Bologna, Italy.
6. Rheumatology Unit, University of Pisa, Italy. simone.barsotti.pisa@gmail.com