- Correspondence to Frank J Chaloupka, Institute for Health Research and Policy, University of Illinois at Chicago, 1747 W. Roosevelt, Room 558, Chicago, IL 60608, USA; Anne M Hartman, National Cancer Institute, 9609 Medical Center Drive, Room 3E-416, Rockville, MD 20850, USA;
- Received August 29, 2013
- Accepted November 27, 2013
- First published December 23, 2013.
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