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Roesch SC, Norman GJ, Adams MA, Kerr J, Sallis JF, Ryan S, Calfas KJ, Patrick K.Roesch SC, et al.J Health Psychol. 2009 Mar;14(2):313-25. doi: 10.1177/1359105308100216.J Health Psychol. 2009.PMID: 19237499Clinical Trial.