[1] Policlin Scotte, Siena, Italy
[2] Univ Pavia, IRCCS Fdn, Policlin S Matteo, Pavia, Italy
[3] Univ Perugia, Perugia, Italy
[4] Moriggia Pelascini, Gravedona, Italy
[5] CMID Ctr Res Immunopathol & Rare Dis, Dept Med & Expt Oncol, Turin, Italy
[6] Osped Mauriziano Umberto 1, Rheumatol, Turin, Italy
[7] Italian Soc Rheumatol, Epidemiol Unit, Milan, Italy
[8] Sapienza Univ Rome, Rome, Italy