- Correspondence to Carmen Iñiguez, Centre Superior d'Investigació en Salut Pública, Avda Cataluña no 21, 46020 Valencia, Spain;
- Accepted December 7, 2010
- First published January 12, 2011.
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.