7 Rheumatology Unit, School of Medicine, University of Modena and Reggio Emilia, Modena, and Rheumatology Clinic Madonna dello Scoglio Cotronei, Crotone, Italy.
8 Medicine & Rheumatology Unit, IRCCS Istituto Ortopedico Rizzoli, Bologna, and Department of Biomedical and Neuromotor Sciences (DIBINEM), University of Bologna, Italy.