[1] Sapienza Univ Roma, Dipartimento Med Interna & Specialita Med, V Le Porta Tiburtina,28, I-00185 Rome, Italy
[2] Seconda Univ Napoli, Dipartimento Internist Clin & Sperimentale, Naples, Italy
[3] Univ Pisana, Azienda Osped, UO Reumatol, Pisa, Italy
[4] Univ Siena, Dipartimento Med Clin & Sci Immunol, Sez Reumatol, Siena, Italy
[5] Univ Politecn Marche, Dipartimento Reumatol, Ancona, Italy
[6] Univ Firenze, Dipartimento Med Interna, Florence, Italy
[7] Univ Pavia, Unita Operat Reumatol, IRCCS Policlin S Matteo, Pavia, Italy