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 268 OP 268 DO 10.1136/emj.2002.000935corr1 VO 21 IS 2 YR 2004 UL http://emj.bmj.com/content/21/2/268.4.abstract AB