[1] South Manchester University Hospitals Trust,
[2] Withington Hospital,undefined
[3] Didsbury,undefined
[4] Manchester M2O 2LR,undefined
[5] UK e-mail: bpal@fs1.with.man.ac.uk Tel.: +44-161-2914283; Fax: +44-161-4455631,undefined
[6] Clinical Audit Department,undefined
[7] Withington Hospital,undefined
[8] Didsbury,undefined
[9] Manchester M2O 2LR,undefined
[10] UK,undefined
[11] Accident and Emergency Medicine,undefined
[12] Withington Hospital,undefined
[13] Didsbury,undefined
[14] Manchester M2O 2LR,undefined
[15] UK,undefined