6A Trialists' Collaboration.Collaborative overview of randomised trials of antiplatelet therapy-llI:reduction in venous thrombosis and pulmonary embolism by antiplatelet prophylaxis among surgical and medical patients.BMJ,1994,308(6923): 235-246.
7Heit JA,Silverstein MD,Mohr DN,et al.Risk factors for deep vein thrombosis and pulmonary embolism:a population based case control study.Arch Intern Med,2000,160(6):809-815.
8Geerts WH, Bergqvist D, Pineo GF, et al. Prevention of venous thromboembolism : American College of Chest Physicians Evidence- Based Clinical Practice Guidelines ( 8th Edition ) [ J ]. Chest, 2008,133(6) :381S-453S. DOI:10. 1378/chest. 08-0656.
9Bahl V, Hu HM, Henke PK, et al. A validation study of a retrospective venous thromboembolism risk scoring method [ J ]. Ann Surg, 2010, 251 (2): 344-350. DOI~ 10. 1097/SLA. 0b013e3181bTfca6.
