- Correspondence to Gavin D Perkins, University of Warwick, Division of Health Sciences, Warwick Medical School, Coventry, UK, CV4 7AL;
- Accepted September 27, 2011
- First published November 1, 2011.
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.