4th Department of Surgery,National and Kapodistrian University of Athens,Attikon University Hospital,Athens 12462,Greece;
Department of Vascular Surgery,National and Kapodistrian University of Athens,Attikon University Hospital,Athens 12462,Greece;
1st Department of Surgery,National and Kapodistrian University of Athens,Laikon Hospital,Athens 11527,Greece;
Deep; vein; thrombosis; Pulmonary; embolism; Gastro-intestinal; cancer; Thromboprophylaxis; Venous; thromboembolism;