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.A1082 A1 D.F. Kallmes A1 H.J. Cloft YR 2008 UL http://www.ajnr.org/content/early/2008/04/18/ajnr.A1082.abstract AB