John D Kakisis1, George Geroulakos2. 1. Department of Vascular Surgery, "Attikon" Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece. Electronic address: kakisis@med.uoa.gr. 2. Department of Vascular Surgery, "Attikon" Hospital, School of Medicine, National and Kapodistrian University of Athens, Athens, Greece.