[1] Univ Athens, Sch Med, Dept Med & Lab 2, Joint Rheumatol Program,Clin Immunol Rheumatol Un, Athens, Greece
[2] Univ Athens, Sch Med, Dept Propedeut Internal Med 1, Joint Rheumatol Program, Athens, Greece
[3] Sismanoglio Hosp, Rheumatol Unit, Athens, Greece
[4] Univ Ioannina, Rheumatol Clin, Ioannina, Greece
[5] NIMTS Hosp, Rheumatol Unit, Athens, Greece
[6] Asklipi Gen Hosp, Rheumatol Unit, Athens, Greece
[7] Democritus Univ Thrace, Rheumatol Clin, Thrace, Greece
[8] Aristotle Univ Thessaloniki, Dept Med 4, Thessaloniki, Greece
[9] Univ Athens, Sch Med, Attikon Hosp, Joint Rheumatol Program,Dept Med 4, Athens, Greece