1. Centre for Health Services Studies, University of Kent, Kent, UK
2. Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London, UK
3. Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK
4. Public Health and Policy Studies, Swansea University, Swansea, UK
5. Centre for Research in Primary and Community Care, University of Hertfordshire, Hertfordshire, UK
6. Department of Social and Environmental Health Research, London School of Hygiene and Tropical Medicine, London, UK
7. Department of Social Policy, University of Lincoln, Lincoln, UK