- Correspondence to: Professor A J Hedley, Department of Community Medicine and Unit for Behavioural Sciences, University of Hong Kong Medical Centre, 21 Sassoon Road, Hong Kong;
- Received August 18, 2001
- Accepted April 25, 2002
- Revised November 12, 2001
- First published September 1, 2002.
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.