- Correspondence to Dr Thomas R Kirchner, The Steven A. Schroeder National Institute for Tobacco Research and Policy Studies, Legacy, 1724 Massachusetts Ave, NW, Washington, DC 20036, USA;
- Received July 18, 2013
- Accepted January 29, 2014
- First published February 25, 2014.
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.