PT - JOURNAL ARTICLE ED - , TI - Answers DP - 2007 Feb 01 TA - Practical Neurology PG - 64--64 VI - 7 IP - 1 4099 - http://pn.bmj.com/content/7/1/64.short 4100 - http://pn.bmj.com/content/7/1/64.full SO - Pract Neurol2007 Feb 01; 7