- Correspondence to Assistant Professor Margaret Kruk, Columbia University, Mailman School of Public Health, 600 W. 168th Street, Room 606, New York, NY 10032, USA.
- Accepted December 4, 2009
- First published August 18, 2010.
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.