- M Laaksonen, PhD, Department of Public Health, PO Box 41, FIN-00014 University of Helsinki, Helsinki, Finland;
- Accepted May 18, 2007
- First published March 13, 2008.
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.