- Correspondence to Dr Richard A Crosby, Department of Health Behavior, College of Public Health at the University of Kentucky, 151 Washington Avenue, Lexington, KY 40506-0003, USA;
- Accepted August 8, 2012
- First published September 21, 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.