- Correspondence to Dr Vilma Pinheiro Gawryszewski, Health Analysis and Information Project, Pan American Health Organization, 525 23rd Street, Washington, DC 20037, USA;
- Received February 16, 2012
- Accepted May 25, 2012
- First published July 22, 2012.
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.