1. Department of Internal Medicine, “Hippokration” General Hospital of Athens, Athens, Greece
2. 1st Cardiology Clinic, Medical School, National and Kapodistrian University of Athens, “Hippokration” General Hospital, Athens, Greece
3. 2nd Department of Medicine and Laboratory, Clinical Immunology - Rheumatology Unit, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece