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.A1047 A1 David F. Kallmes A1 Kennith F. Layton A1 William F. Marx A1 Frank Tong YR 2008 UL http://www.ajnr.org/content/early/2008/05/08/ajnr.A1047.1.abstract AB