[1] Attikon Univ Hosp, Athens, Greece
[2] 4th Univ Clin Internal Med, Rheumatol & Clin Immunol Unit, Chaidari, Greece
[3] KAT Gen Hosp, Rheumatol, Kifisia, Greece
[4] Natl & Kapodistrian Univ Athens, Lab Res Musculoskeletal Syst, Athens, Greece
[5] KAT Gen Hosp, Biochem Lab, Kifisia, Greece