2Patel A P, Koltz M T, Sansur C A, et al. An analysis of deep vein thrombosis in 1277 consecutive neurosurgi- cal patients undergoing routine weekly ultrasonography: Clinical article[J]. Journal of neurosurgery, 2013,118(3):505 -509.
3Turpie A G G, Lassen M R, Eriksson B I, et al. Ri- varoxaban for the prevention of venous thromboembolismafter hip or knee arthroplasty[J]. Thromb Haemost, 2011, 105(3): 444-453.
4Hirsh J, Rasehke R. Heparin and low-molecular-weight heparin the Seventh ACCP Conference on Antithrombotic and Thrombolytic Therapy[J]. CHEST Journal, 2004, 126(3): 188-203.