PT - JOURNAL ARTICLE ED - , TI - Correction AID - 10.1136/practneurol-2011-000009corr1 DP - 2011 Aug 01 TA - Practical Neurology PG - 258--258 VI - 11 IP - 4 4099 - http://pn.bmj.com/content/11/4/258.short 4100 - http://pn.bmj.com/content/11/4/258.full SO - Pract Neurol2011 Aug 01; 11