This is a "connection" page, showing publications co-authored by Wenjun Li and Joseph DiFranza.
Doubeni CA, Li W, Fouayzi H, DiFranza JR. Perceived accessibility of cigarettes among youth: a prospective cohort study. Am J Prev Med. 2009 Mar; 36(3):239-42.
Doubeni CA, Li W, Fouayzi H, Difranza JR. Perceived accessibility as a predictor of youth smoking. Ann Fam Med. 2008 Jul-Aug; 6(4):323-30.