RT Journal Article SR Electronic T1 Chest pain observation units JF Emergency Medicine Journal JO Emerg Med J FD BMJ Publishing Group Ltd and the British Association for Accident & Emergency Medicine SP 148 OP 148 DO 10.1136/emj.18.2.148 VO 18 IS 2 A1 Louis Graff YR 2001 UL http://emj.bmj.com/content/18/2/148.1.abstract AB