RT Journal Article SR Electronic T1 Reply: JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP E108 OP E108 DO 10.3174/ajnr.A3220 VO 33 IS 7 A1 Cruz, J.P. A1 O'Kelly, C. A1 Spears, J. A1 Marotta, T.R. YR 2012 UL http://www.ajnr.org/content/33/7/E108.abstract AB