[1] Attikon Univ Hosp, Rheumatol & Clin Immunol, Athens, Greece
[2] Univ Hosp Heraklion, Rheumatol Clin Immunol & Allergy, Iraklion, Greece
[3] Asklipieion Gen Hosp, Dept Rheumatol, Athens, Greece
[4] G Gennimatas Gen Hosp, Dept Rheumatol, Athens, Greece
[5] Ippokrateion Gen Hosp, Dept Internal Med 2, Athens, Greece
[6] Evangelismos Gen Hosp, Dept Rheumatol, Athens, Greece
[7] Ippokrateion Gen Hosp, Dept Rheumatol, Thessaloniki, Greece
[8] G Gennimatas Gen Hosp, Dept Rheumatol, Athens, Greece
[9] Hacettepe Univ, Fac Med, Dept Rheumatol, Ankara, Turkey