2Geerts WH,Bergqvist D,Pineo GF,et al.Prevention of venousthromboembolism:American College of Chest Physicians Evidence BasedClinical Practice Guidelines (8 th Edition)[J].Chest,2008,133:381 S -453 S.
3Gould MK,Garcia DA,Wren SM.Prevention of VTE in non orthopedicsurgical patients:antithrombotic therapy and prevention of thrombosis:American College of Chest Physicians Evidence.Based Clinical PracticeGuidelines (9 th Edition)[J].Chest,2012,141(2):e 227 S.
