- Correspondence to Dr D Faeh, University of Zurich, Institute of Social and Preventive Medicine, Hirschengraben 84, 8001 Zürich, Switzerland;
- Accepted March 21, 2009
- First published September 11, 2009.
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.