Nason Maani1, May Ci van Schalkwyk2, Mark Petticrew1, Kent Buse3. 1. Department of Public Health, Environments and Society, London School of Hygiene and Tropical Medicine and UK Prevention Research Partnership SPECTRUM Consortium, London, UK. 2. Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine. 3. Healthier Societies Program, The George Institute for Global Health, Imperial College London.