RT Journal Article SR Electronic T1 Reply JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 2021 OP 2021 VO 20 IS 10 A1 Kwan, Eddie YR 1999 UL http://www.ajnr.org/content/20/10/2021.1.abstract AB