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Gottfredson, Denise C and Cook, Thomas D and Gardner, Frances EM and Gorman-Smith, Deborah and Howe, George W and Sandler, Irwin N and Zaff, Kathryn M (2015) Standards of evidence for efficacy, effectiveness, and scale-up research in prevention science: next generation. Prevention Science , 16 , (7) , pp. 893-926.