1 Research Laboratory and Academic Division of Clinical Rheumatology, Department of Internal Medicine and Medical Specialities, University of Genova, Policlinico San Martino, Genova, Italy.
2 Chair and Division of Rheumatology, Policlinico San Matteo Foundation, University of Pavia, Pavia, Italy.
3 Dipartimento Scienze Cliniche e Biologiche, Università degli Studi di Torino, Turin, Italy.