Correlation of North American Symptomatic Carotid Endarterectomy Trial (NASCET) angiographic definition of 70 % to 99 % internal carotid artery stenosis with duplex scanning. - Moneta,G.L.; Edwards,J.M.; Chitwood,R.W.; Taylor,L.M.; Lee,R.W.; Cummings,C.A.; Porter,J.M. (J Vasc Surg, 1993)