Variability of Doppler US measurements along the common carotid artery: effects on estimates of internal carotid arterial stenosis in patients with angiographically proved disease. - Lee,V.S.; Hertzberg,B.S.; Workman,M.J.; Smith,T.P.; Kliewer,M.A.; DeLong,D.M.; Carroll,B.A. (Radiology, 2000)