RT Journal Article SR Electronic T1 Guidelines for difficult airway equipment in emergency departments JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 230 OP 230 DO 10.1136/emj.2008.060038 VO 26 IS 3 YR 2009 UL http://emj.bmj.com/content/26/3/230.1.abstract AB