RT Journal Article SR Electronic T1 Reply: JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 1840 OP 1841 DO 10.3174/ajnr.A0731 VO 28 IS 10 A1 M. Petruzzellis A1 R. De Blasi A1 V. Lucivero A1 M. Sancilio A1 M. Prontera A1 A. Tinelli A1 D.M. Mezzapesa A1 F. Federico YR 2007 UL http://www.ajnr.org/content/28/10/1840.2.abstract AB