1. Deep vein thrombosis: advancing awareness to protect patient lives. In. Washington, D.C;Association,2003
2. Estimated annual numbers of US acute-care hospital patients at risk for venous thromboembolism;Anderson;Am J Hematol,2007
3. Prevention of venous thromboembolism: brief update review;ER,2013
4. Prevention of VTE in nonorthopedic surgical patients: antithrombotic therapy and prevention of thrombosis, 9th ed: American College of chest physicians evidence-based clinical practice guidelines;Gould;Chest,2012
5. Thromboprophylaxis in surgical patients;O’Donnell;Can J Surg,2003