2Geerts WH,Heit JA,Clagtt GP,et al.Prevention of venousthromboembolism[J].Chest,2001,119:S132-S175.
3Anderson FA,Wheeler HB,Goldberg RJ,et al.A popuation-based perspecive of the hospital incidence and casefatality rateS of deep vein thrombosis and pulmonary embolism:the Worcester DVT Study[J].Arch Inten Med,1991,151:933-938.
