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 1058 OP 1058 DO 10.1136/emermed-2011-200720corr1 VO 28 IS 12 YR 2011 UL http://emj.bmj.com/content/28/12/1058.abstract AB