- 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 6 July 2004
- Published in print 1 June 2005.
- Published online 20 May 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.