Hypertension Excellence Centre-ESH, Department of Cardiology, LAIKO General Hospital, Athens, Greece. Laboratory of Experimental Surgery and Surgical Research "N.S. Christeas", University of Athens, Medical School, Athens, Greece. 1st Department of Internal Medicine, LAIKO General Hospital, University of Athens, Medical School, Athens, Greece. University of Athens, 1st Department of Cardiology, Hippokrateion Hospital, Athens, Greece.