RT Journal Article SR Electronic T1 Gum elastic bougies in difficult intubation JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 376 OP 377 DO 10.1136/emj.18.5.376-a VO 18 IS 5 A1 Simon Carley A1 John Butler YR 2001 UL http://emj.bmj.com/content/18/5/376.2.abstract AB