RT Journal Article SR Electronic T1 BET 2 JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 622 OP 623 DO 10.1136/emj.2010.097741 VO 27 IS 8 YR 2010 UL http://emj.bmj.com/content/27/8/622.abstract AB