RT Journal Article SR Electronic T1 Sophia JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 522 OP 522 VO 24 IS 7 A1 Baron, Tanya A1 Wyatt, Jonathan YR 2007 UL http://emj.bmj.com/content/24/7/522.abstract AB