RT Journal Article SR Electronic T1 Year Book of Critical Care Medicine 1990 JF Archives of Emergency Medicine JO Arch Emerg Med FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 278 OP 278 DO 10.1136/emj.8.4.278-a VO 8 IS 4 A1 P. Nightingale YR 1991 UL http://emj.bmj.com/content/8/4/278.1.abstract AB