RT Journal Article SR Electronic T1 JournalScan JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 176 OP 177 DO 10.1136/emj.20.2.176 VO 20 IS 2 A1 Jonathan Wyatt A1 Walid Alsalim YR 2003 UL http://emj.bmj.com/content/20/2/176.abstract AB