1. Department of Hygiene, Epidemiology and Medical Statistics; School of Medicine; National and Kapodistrian University of Athens; Athens Greece
2. Internal Medicine Department; General Hospital of Kimi; Kimi Greece
3. Hypertension Unit and Cardiovascular Research Laboratory; First Department of Propaedeutic Internal Medicine; Laiko Hospital; Athens Greece
4. First Department of Cardiology; School of Medicine; Hippokrateion Hospital; National and Kapodistrian University of Athens; Athens Greece
5. Second Department of Neurology; Attikon University General Hospital; School of Medicine; National and Kapodistrian University of Athens; Athens Greece
6. Department of Neurology; University of Tennessee Health Sciences Center; Memphis Tennessee USA
7. International Clinical Research Center; St. Anne's University Hospital in Brno; Brno Czech Republic