1. Centre for Implementation Science, Health Services and Population Research Department, Institute of Psychiatry, Psychology & Neuroscience, King’s College London, David Goldberg Centre, De Crespigny Park, London SE5 8AF, UK
2. Centre for Health Policy, School of Public Health, School of Public Health Building. University of the Witwatersrand, 27 St Andrews Road, Parktown, 2193 South Africa
3. School of Public Health and Family Medicine, University of Cape Town, Falmouth Building, Anzio Road, Cape Town, 7925, South Africa
4. Department of Global Health & Social Medicine, School of Global Affairs, Faculty of Social Science & Public Policy, King’s College London, Bush House, North East Wing, 40 Aldwych, London, WC2B 4BG, UK