- Correspondence to: Valerie Yerger, MA, ND, Center for Tobacco Control Research and Education, 530 Parnassus Avenue, Suite 366, University of California, San Francisco, San Francisco, California, 94143-1390, USA;
- Received 5 June 2002
- Accepted 21 September 2002
- Revised 19 September 2002
- Published online 1 December 2002.
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