- Correspondence to:
Dr F Richy
Santé Publique, Epidémiologie et Economie de la Santé, CHU, Bât B23, B-4000 Sart-Tilman, Belgium, Europe;
- Accepted January 9, 2004
- First published June 11, 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.