Imperial College London, Government of the United States of America - Centers for Disease Control and Prevention (CDC), University of Cape Town (UCT), University of Oxford - Department of Computer Science, Maestral International, Prevention of Violence Unit, World Health Organization, USAID, World Bank - Latin America & the Caribbean Region, University of Oxford, Imperial College London - Department of Mathematics, World Without Orphans, Harvard University - Department of Pediatrics, Imperial College London, Imperial College London - NIHR Health Protection Research Unit for Modelling and Health Economics, University of the Witwatersrand, Government of the United States of America - Centers for Disease Control and Prevention (CDC) and University College London - Institute for Global Health

affiliation not provided to SSRN, affiliation not provided to SSRN, Centers for Disease Control and Prevention - Division of Violence Prevention and Government of the United States of America - Centers for Disease Control and Prevention (CDC)