- Correspondence to: Dr J T F Lau, Centre for Epidemiology and Biostatistics, 5/F, School of Public Health, Prince of Wales Hospital Shatin, NT, Hong Kong;
- Accepted August 14, 2003
- First published November 4, 2003.
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.