1. A comparison between descending phlebography and duplex Doppler investigation in the evaluation of reflux in chronic venous insufficiency: A challenge to phlebography as the “gold standard” 
Peter Neglen, MD, PhD*, Seshadri Raju, MD 
Journal of Vascular Surgery 
Volume 16, Issue 5, Pages (November 1992)
DOI: / (92)90222-T
Copyright © 1992 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

2. Fig. 1
Average grade and score of different modes of phlebographic and ultrasound investigations of lower limbs with clinical severity class 0/1 (n = 34) compared with results in class 2/3 (n = 22) (mean ± SEM; ns, not significant). ***p <
Journal of Vascular Surgery  , DOI: ( / (92)90222-T)
Copyright © 1992 Society for Vascular Surgery and the North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions