- Correspondence to Alan John Connor, Darlington Memorial Hospital, Hollyhurst Rd, Darlington, County Durham DL3 6HX, UK;
- Accepted November 3, 2008
- First published October 22, 2009.
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.