- Correspondence to: G N Connolly Harvard School of Public Health, Division of Public Health Practice, Landmark Building, 677 Huntington Avenue, Boston, MA 02115, USA;
- Received December 18, 2006
- Accepted February 28, 2007
- First published September 26, 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.