PT - JOURNAL ARTICLE ED - , TI - Free paper presentations AID - 10.1136/emj.9.1.81 DP - 1992 Mar 01 TA - Archives of Emergency Medicine PG - 81--91 VI - 9 IP - 1 4099 - http://emj.bmj.com/content/9/1/81.short 4100 - http://emj.bmj.com/content/9/1/81.full SO - Arch Emerg Med1992 Mar 01; 9