“…Risk factors for venous thromboembolism includes major medical illnesses, obesity, previous VTE, cancer, age over 60 years [1,9]. Also included in this list is prolonged immobilization, lower limb paralysis (including anesthesia for more than 30 min), use of hormonal therapy (oral contraceptives, hormonal replacement therapy), chemotherapy (including tamoxifen) and co-morbid conditions, such as stroke, congestive heart failure or recent myocardial infarction, or varicose veins [2,6]. Biochemical abnormalities also may predispose to VTE.…”