RT Journal Article SR Electronic T1 BET 3 JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 953 OP 954 DO 10.1136/emj.2010.104935 VO 27 IS 12 YR 2010 UL http://emj.bmj.com/content/27/12/953.2.abstract AB