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 558 OP 560 DO 10.1136/emj.2010.097337 VO 27 IS 7 YR 2010 UL http://emj.bmj.com/content/27/7/558.abstract AB