1. Community and Primary Care Research Group, University of Plymouth, Plymouth, UK
2. Centre for Ageing Population Studies, Research Department of Primary Care and Population Health, University College London, London, UK
3. Department of Health and Community Sciences, Faculty of Health and Life Sciences, University of Exeter, Exeter, UK
4. Medical Statistics, Faculty of Health, University of Plymouth, Plymouth, UK
5. Department of Rehabilitation, Aged and Extended Care, Flinders University, Adelaide, SA, Australia
6. Care Policy and Evaluation Centre, London School of Economics and Political Science, London, UK