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Terry-McElrath, Y.M.,  O'Malley, P.M.,  Johnston L.D. . Exercise and substance use among American youth, 1991-2009. American Journal of Preventive Medicine. 40, (5), 530-540.
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Burns, D.M.,  Johnston L.D. . Overview of recent changes in adolescent smoking behavior. Changing Adolescent Smoking Behavior: Where It Is and Why. Bethesda, MD: National Cancer Institute.
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