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.A1199 A1 Natarajan, S.K. A1 Sekhar, L.N. YR 2008 UL http://www.ajnr.org/content/early/2008/07/10/ajnr.A1199.abstract AB