RT Journal Article SR Electronic T1 Reply: JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP E28 OP E28 DO 10.3174/ajnr.A6986 VO 42 IS 4 A1 Larson, A.S. A1 Brinjikji, W. YR 2021 UL http://www.ajnr.org/content/42/4/E28.abstract AB