1. University of Sheffield, Sheffield Institute for Studies on Ageing, Sheffield,
2. University of Sheffield, Sheffield Institute for Studies on Ageing, Sheffield
3. University of Bradford, School of Health Studies, Bradford
4. University of Lancaster, Institute for Health Research, Lancaster
5. Peninsula Medical School, Primary Care, Plymouth
6. Section of Public Health, School of Health and Related Research, University of Sheffield, Sheffield
7. Royal Devon and Exeter Hospital, Exeter and C Ruse Sheffield Teaching Hospitals Trust, Sheffield
8. Sheffield Teaching Hospitals Trust, Sheffield