- Correspondence to:
Prof. D G Cook
Professor of Epidemiology, Department of Community Health Sciences, St George’s Hospital Medical School, Cranmer Terrace, London SW17 0RE, UK;
- Accepted July 6, 2004
- First published May 20, 2005.
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.