[1] Univ Athens, Sch Med, Dept Physiol, Athens, Greece
[2] Univ Hosp Athens Attikon, Dept Internal Med 4, Rheumatol & Clin Immunol Unit, Athens, Greece
[3] Gen Hosp Athens G Gennimatas, Rheumatol Dept, Athens, Greece
[4] Univ Athens, Sch Med, Dept Pathophysiol, Athens, Greece
[5] Univ Athens, Sch Med, Joint Rheumatol Acad Program, Athens, Greece