- Correspondence to: Rudolf Mak MD, Department of Public Health, Ghent University, De Pintelaan 185, 9000 Ghent, Belgium;
- Accepted May 7, 2003
- First published March 30, 2004.
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.