RT Journal Article SR Electronic T1 Potter’s potions JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 217 OP 218 DO 10.1136/emj.2007.052084 VO 25 IS 4 A1 A C McGregor A1 M H MacMillian A1 J Ferguson YR 2008 UL http://emj.bmj.com/content/25/4/217.abstract AB