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Tena L. St. Pierre, Melvin M. Mark, D. Lynne Kaltreider, Kathryn J. Aikin, A 27-Month Evaluation of a Sexual Activity Prevention Program in Boys & Girls Clubs across the Nation, Family Relations, Vol. 44, No. 1 (Jan., 1995), pp. 69-77
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Pierre et al. (1995) studied this question.
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