PT - JOURNAL ARTICLE ED - , TI - Erratum AID - 10.3174/ajnr.A1735 DP - 2009 Jul 17 TA - American Journal of Neuroradiology 4099 - http://www.ajnr.org/content/early/2009/07/17/ajnr.A1735.short 4100 - http://www.ajnr.org/content/early/2009/07/17/ajnr.A1735.full