1. School of Health and Related Research (ScHARR), University of Sheffield, Sheffield, UK
2. Department of Public Health, University of Liverpool, Whelan Building, Liverpool L69 3GB, UK
3. Institute of Population Health Sciences, Newcastle University, Baddiley-Clark Building, Richardson Road, Newcastle upon Tyne NE2 4AX, UK
4. Division of Health Research, Lancaster University, Lancaster LA1 4YG, UK
5. School of Social and Political Science, The University of Edinburgh, Edinburgh, UK
6. Department of Public Health Environments and Society, London School of Hygiene and Tropical Medicine, 15 − 17 Tavistock Place, London, UK
7. Department of Sociological Studies, University of Sheffield, Sheffield, UK