- Correspondence to: Jean-François Etter Institute of social and preventive medicine, University of Geneva. CMU, case postale, CH-1211 Geneva 4, Switzerland;
- First published July 13, 2007.
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.