RT Journal Article SR Electronic T1 CORRECTION JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 521 OP 521 DO 10.1136/emj.2007.47860corr1 VO 24 IS 7 YR 2007 UL http://emj.bmj.com/content/24/7/521.2.abstract AB