- Dr M S Pearce, Sir James Spence Institute, Newcastle University, Royal Victoria Infirmary, Newcastle upon Tyne NE1 4LP, UK;
- Received January 22, 2008
- Accepted March 19, 2008
- First published April 11, 2008.
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.