PT - JOURNAL ARTICLE AU - Castillo, M. TI - ☺ AID - 10.3174/ajnr.A2929 DP - 2011 Dec 22 TA - American Journal of Neuroradiology 4099 - http://www.ajnr.org/content/early/2011/12/22/ajnr.A2929.1.short 4100 - http://www.ajnr.org/content/early/2011/12/22/ajnr.A2929.1.full