- Correspondence to:
Mr C R Cardwell
Department of Epidemiology & Public Health, The Queen’s University of Belfast, Grosvenor Road, Belfast BT12 6BJ, Northern Ireland, UK;
- Accepted February 7, 2005
- First published April 25, 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.