1 Division of Rheumatology, University of Pavia, IRCCS Policlinico S. Matteo Foundation, Piazzale Golgi 2, 27100 Pavia, Italy. sara.saramonti@gmail.com.
2 Division of Rheumatology, University of Pavia, IRCCS Policlinico S. Matteo Foundation, Piazzale Golgi 2, 27100 Pavia, Italy.