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Walker D, Stephens R, Rowland J, Roffman R.  2011.  The influence of client behavior during motivational interviewing on marijuana treatment outcome.. Addict Behav. 36(6):669-73.
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Walker DD, Stephens R, Roffman R, Demarce J, Lozano B, Towe S, Berg B.  2011.  Randomized controlled trial of motivational enhancement therapy with nontreatment-seeking adolescent cannabis users: a further test of the teen marijuana check-up.. Psychol Addict Behav. 25(3):474-84.