- Correspondence to: A Pouta National Public Health Institute, Aapistie 1, PO Box 310, FIN-90101 Oulu, Finland;
- Accepted April 17, 2006
- First published October 19, 2006.
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.