1. First Department of Internal Medicine, Laiko General Hospital, National and Kapodistrian University Athens School of Medicine, Athens, Greece
2. Department of Cardiology, Laiko General Hospital, Athens, Greece
3. First Department of Propaedeutic Medicine, Laiko General Hospital, National and Kapodistrian University Athens School of Medicine, Athens, Greece
4. Cardiovascular Prevention and Research Unit, Department of Pathophysiology, National and Kapodistrian University Athens School of Medicine, Athens, Greece
5. Arthritis Research UK Centre for Epidemiology, University of Manchester, Manchester, UK
6. Biomedical Engineering Unit, First Department of Cardiology, Medical School, National and Kapodistrian University of Athens, Athens, Greece