[1] San Camillo Hosp, Dept Rheumatol & Internal Med, Rome, Italy
[2] Univ Parma, Dept Internal Med & Nephrol, I-43100 Parma, Italy
[3] Univ Campus Biomed, Dept Clin Med Immunol & Rheumatol, Rome, Italy
[4] Hosp Reggio Emilia, Dept Nucl Med, Reggio Emilia, Italy