1 Vascular Unit, 5th Department of Surgery, Medical School, Hippokratio Hospital, Aristotle University of Thessaloniki, Konstantinoupoleos 49, 54642, Thessaloníki, Greece. ckarkos@hotmail.com.
2 Vascular Unit, 5th Department of Surgery, Medical School, Hippokratio Hospital, Aristotle University of Thessaloniki, Konstantinoupoleos 49, 54642, Thessaloníki, Greece.