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Assessing the "gateway hypothesis" among middle and high school students in Tennessee
Heavy Drinking and Polydrug Use among College Students
Heavy drinking and polydrug use among college students
Nonmedical prescription drug use and delinquency: an analysis with a national sample
Poly-drug use among ecstasy users: separate, synergistic, and indiscriminate patterns
Predictors of trauma and PTSD among heroin users: a prospective longitudinal investigation