1[1]Schulman S,et al. A comparison of six weeks with six months of oral anticoagulant therapy after a first episode of venous thromboembolism. N Eng1 J Med,1995,332:1661
2[2]Kearon C,et al. A comparison of three months of anticoagulation with extended anticoagulation for a first episode of idiopathic venons thromboembolism, N Eng1 J Med, 1999,340: 901
3[3]Brandjes DPM,et al. Randomised trial of the effect of compression stockings in patients with symptomatic proximal-vein thrombosis.Lancet. 1997,349: 759
