RT Journal Article SR Electronic T1 Ambulances JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 488 OP 488 DO 10.1136/heart.86.5.488 VO 86 IS 5 A1 M K DAVIES A1 A HOLLMAN YR 2001 UL http://heart.bmj.com/content/86/5/488.abstract AB