- Correspondence to: Dr S M McGhee, Department of Community Medicine, University of Hong Kong, 5th Floor, University of Hong Kong Medical Centre, 21 Sassoon Road, Hong Kong;
- Accepted April 10, 2002
- First published December 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.