[1] Univ Naples 2, Dept Clin & Expt Med, Rheumatol Unit, Naples, Italy
[2] Kings Coll Hosp London, Ctr Rheumatol, Dept Med, London, England
[3] Sidi Bouzid Hosp, Fac Sousse, Dept Internal Med, Ibn Aljazzar Med, Sidi Bouzid, Tunisia
[4] Serv Reumatol Inmunol Clin HRUJMCB, Jefe Serv, Santiago, Dominican Rep
[5] UCL, Dept Med, Ctr Rheumatol, London, England