6Zwiebel WJ,Pellerito J.Introduction to Vascular Ultrasonogmphy[M]. 5 th. London:Saunders,2004.
7Kearon C,Julian JA,Math M,et al.Noninvasive diagnosis of deep vein thrombosis[J].Ann Intern Meal,1998,128(8):663-677.
8Nacklon NS.Diagnosis of deep venous thrombosis and pulmonary embolism in pregnancy[J].Curr Opin Med,1999,5(4):233-237.
9Lockhart,ME,Sheldon,HI,Robbin,ML.Augmentation in lower extremity sonography for the detection of deep venous thrombosis[].American Journal of Roentgenology.2005