TY - JOUR T1 - <em>Reply:</em> JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - E37 LP - E37 DO - 10.3174/ajnr.A2019 VL - 31 IS - 3 AU - D. Dai AU - D.F. Kallmes Y1 - 2010/03/01 UR - http://www.ajnr.org/content/31/3/E37.abstract N2 - ER -