King's Thrombosis Centre have published an article in CHEST evaluating the impact of compulsory VTE risk assessment on the incidence of hospital-associated VTE. A significant reduction in the incidence of HAT was observed following sustained achievement of 90% risk assessment (RR 0.88, 95% CI 0.74 - 0.98; P=0.014). The article entitled "Comprehensive venous thromboembolism prevention programme incorporating mandatory risk assessment reduces the incidence of hospital-associated thrombosis" can be accessed here