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 546 OP 546 DO 10.1136/emj.2009.078196 VO 26 IS 7 A2 Hanneli Piek A2 Jonathan Wyatt YR 2009 UL http://emj.bmj.com/content/26/7/546.abstract AB