J. Doyle1, E. Waters1, E. Noonan2, N. Royle3, K. Kowalski4, C. Gill5, D.B. Wilson5,6 Cochrane Public Health Review Group, McCaughey Centre, VicHealth Centre for the Promotion of Mental Health and Community Wellbeing, University of Melbourne, Australia The Campbell Collaboration, Head Office, Oslo, Norway The Cochrane Collaboration, Oxford, UK Campbell Social Welfare Group, Nordic Campbell Centre, Sfi The Danish National Centre For Social Research, Denmark Campbell Crime and Justice Group, Jerry Lee Center of Criminology, University of Pennsylvania, USA Administration of Justice Department, George Mason University, USA Address correspondence to J. Doyle, E-mail: lisajw@unimelb.edu.au