TY - JOUR JF - American Journal of Neuroradiology JO - Am. J. Neuroradiol. SP - 518 LP - 518-b VL - 25 IS - 3 A2 - , Y1 - 2004/03/01 UR - http://www.ajnr.org/content/25/3/518.2.abstract N2 - ER -