- Correspondence to: Dr Z Perkins Staffordshire Ambulance Service NHS Trust, 70 Stone Road, Stafford ST16 2TQ, UK;
- Accepted December 22, 2006
- First published March 23, 2007.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.