1 Department of Sociology and King's College, University of Cambridge, Cambridge CB2 1ST, UK. Electronic address: [email protected].
2 European Centre on Health of Societies in Transition (ECOHOST), London School of Hygiene & Tropical Medicine, London, UK; European Observatory on Health Systems and Policies, London, UK.
3 Department of Sociology and King's College, University of Cambridge, Cambridge CB2 1ST, UK.
4 Department of Sociology, University of Oxford, Oxford, UK.