- Correspondence to: Dr S Z Abildstrom, National Institute of Public Health, Svanemollevej 25, DK-2100 Copenhagen, Denmark;
- Accepted June 12, 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.