[1] Azienda Osped Policlin Modena, Rheumatol Unit, Modena, Italy
[2] Univ Bari, Rheumatol Unit, Bari, Italy
[3] Santa Chiara Hosp, Rheumatol Unit, Pisa, Italy
[4] Univ Siena, Univ Complex San Niccolo, Rheumatol Unit, Siena, Italy
[5] Univ Messina, Rheumatol Unit, Messina, Italy
[6] San Camillo Forlanini Hosp, Rheumatol Unit, Rome, Italy
[7] Univ Modena & Reggio Emilia, Rheumatol Unit, Modena, Italy
[8] Azienda Osped Policlin Modena, Resp Dis Unit, Modena, Italy
[9] Univ Pisa Facolta Med & Chirurg, Rheumatol Unit, Pisa, Italy
[10] Univ Verona, Rheumatol Unit, Verona, Italy