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Who Is At Risk? Frequent flyers and other long distance travellersWomen taking contraceptive pills People over 40 People who have recently had surgery or an injury (especially lower limbs) People over 6 feet or under 5 feet in height Smokers People with cancer, chronic heart diseases, diabetes or obesity People with a genetic predisposition such as Leiden Factor 5 Family history of DVT, especially under 35 Chronic Venous Insufficiency History of malignancy |  |