PT - JOURNAL ARTICLE ED - , TI - See page 229 for answers DP - 2009 Mar 01 TA - Emergency Medicine Journal PG - 159--159 VI - 26 IP - 3 4099 - http://emj.bmj.com/content/26/3/159.short 4100 - http://emj.bmj.com/content/26/3/159.full SO - Emerg Med J2009 Mar 01; 26