RT Journal Article SR Electronic T1 BET 1 JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 393 OP 394 DO 10.1136/emj.2010.094888 VO 27 IS 5 YR 2010 UL http://emj.bmj.com/content/27/5/393.2.abstract AB