- Correspondence to: Nathaniel Wander PhD, Department of Social and Behavioral Sciences/Center for Tobacco Control Research & Education, University of California, San Francisco, 3333 California Street, Suite 455, Box 0612, San Francisco, CA, 94143-0612, USA;
- Received December 2, 2005
- Accepted December 16, 2005
- First published May 25, 2006.
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