- Correspondence to Dr Jennifer A Taylor, Department of Environmental and Occupational Health, Drexel University School of Public Health, 1505 Race Street, MS 1034, Philadelphia, PA 19102, USA;
- Received November 20, 2012
- Revised January 22, 2013
- Accepted January 23, 2013
- First published February 12, 2013.
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.