RT Journal Article SR Electronic T1 Reply: JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP E98 OP E98 DO 10.3174/ajnr.A3188 VO 33 IS 6 A1 Buis, D.R. A1 Vandertop, W.P. A1 Bot, J.C.J. A1 Barkhof, F. A1 Knol, D.L. A1 Lagerwaard, F.J. A1 Slotman, B.J. A1 van den Berg, R. YR 2012 UL http://www.ajnr.org/content/33/6/E98.abstract AB