1. Department of Social and Environmental Health Research, London School of Hygiene and Tropical Medicine, London, UK
2. Department of Public Health and Policy, University of Liverpool, Liverpool, UK
3. Centre for Reviews and Dissemination, University of York, York, UK
4. MRC Social and Public Health Sciences Unit (SPHSU), University of Glasgow, Glasgow, UK
5. School of Geography, Queen Mary University of London, London, UK
6. Institute for Health and Human Development, University of East London, London, UK