Karen M Devries1, Franziska Meinck2. 1. Child Protection Research Group, London School of Hygiene and Tropical Medicine, London, WC1H 9SH, UK. Electronic address: karen.devries@lshtm.ac.uk. 2. Centre for Evidence-Based Interventions, Department of Social Policy and Intervention, University of Oxford, Oxford, UK; School of Behavioural Sciences, North-West University, Vanderbeijlpark, South Africa.