RT Journal Article SR Electronic T1 Comparisons between Carotid Duplex Sonography and Cerebral Angiography in Assessing the Degree of Carotid Stenosis JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 618 OP 618 VO 21 IS 4 A1 Allan J Fox YR 2000 UL http://www.ajnr.org/content/21/4/618.abstract AB