Joseph R. DiFranza and W.W. Sanouri A. Ursprung
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Robert Scragg, Robert J . Wellman, Murray Laugesen and Joseph R. DiFranza
Addictive Behaviors 33 ( 5 ): 689 - 698 , 2008
W.W. Sanouri A. Ursprung, Sharon M. DiFranza, Andrew D. Costa and Joseph R. DiFranza
Addictive Behaviors 34 ( 2 ): 227 - 231 , 2009