7Labropoulos N,Webb KM,Kang SS,et al.Pattems and distribution of isolated calf deep wein thrombosis[J].Vasc Surg,1999,30(5):787.
8Schutens RE,Ackerrna.rk P,Haaa F,et al.Combination of a normal D-dimer concentration and a non-high pretest clinical probability score is a safe strategy to exclude deep venous thrombosis[J].Circulation,2003,107(4):593.