1. Department of Sociology, University of Cambridge, Cambridge, UK
2. Department of Epidemiology and Public Health, University College London, London, UK
3. Department of Social Policy, London School of Economics and Political Science, London, UK
4. Department of Social Policy and Intervention and Nuffield College, University of Oxford, Oxford, UK
5. European Centre on Health of Societies in Transition, London School of Hygiene and Tropical Medicine, London, UK
6. Institute of Health Equity, University College London, London, UK
7. Department of Economics, University of Massachusetts, Amherst, USA