PT - JOURNAL ARTICLE ED - , TI - CORRECTION AID - 10.1136/jnnp.2008.158303corr1 DP - 2009 May 01 TA - Journal of Neurology, Neurosurgery & Psychiatry PG - 584--584 VI - 80 IP - 5 4099 - http://jnnp.bmj.com/content/80/5/584.short 4100 - http://jnnp.bmj.com/content/80/5/584.full SO - J Neurol Neurosurg Psychiatry2009 May 01; 80