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 249 OP 249 DO 10.1136/emj.2009.086132corr1 VO 27 IS 3 YR 2010 UL http://emj.bmj.com/content/27/3/249.3.abstract AB