- Professor Jane Wardle, Department of Epidemiology and Public Health, University College London, 2–16 Torrington Place, London WC1E 6BT, UK;
- Accepted January 22, 2007
- First published November 13, 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.