1. Division of Public Health and Policy, University of Liverpool, Liverpool, UK
2. Department of Health Research, Lancaster University, Lancaster, UK
3. Department of Social and Environmental Health Research, London School of Hygiene and Tropical Medicine, London, UK
4. Department of Geography, Centre for Health Inequalities Research, South Road, Durham University, Durham, UK
5. Section of Public Health, School of Health and Related Research, University of Sheffield, Sheffield, UK
6. University of Exeter, University of Exeter Medical School, College House, St Luke’s Campus, Exeter, UK