RT Journal Article SR Electronic T1 Reply: JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A6986 A1 A.S. Larson A1 W. Brinjikji YR 2021 UL http://www.ajnr.org/content/early/2021/03/04/ajnr.A6986.abstract AB