1. Department of Physiology, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece
2. Second Internal Medicine Unit, 401 General Military Hospital of Athens, Athens, Greece
3. Rheumatology Unit, 251 Air Force General Hospital, Athens, Greece
4. Rheumatology Outpatient Unit, Department of Pathophysiology, School of Medicine, National and Kapodistrian University of Athens, Laikon Hospital, Athens, Greece