- Carme Borrell, Agència de Salut Pública de Barcelona, Plaça Lesseps 1, 08023 Barcelona, Spain;
- Accepted April 24, 2007
- First published February 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.