1. Bradford Institute for Health Research, Bradford Teaching Hospitals NHS Trust; Academic Unit of Elderly Care and Rehabilitation; Temple Bank House Bradford Royal Infirmary Bradford UK BD9 6RJ
2. Leeds Institute of Health Sciences, University of Leeds; Academic Unit of Elderly Care and Rehabilitation; Bradford UK
3. Leeds Teaching Hospitals NHS Trust; Department of Elderly Care; Leeds General Infirmary Great George Street Leeds UK LS1 3EX
4. Leeds Institute of Health Sciences, University of Leeds; Academic Unit of Primary Care; Charles Thackrah Building 101 Clarendon Road Leeds UK LS2 9LJ
5. University of Leeds; Centre for Epidemiology and Biostatistics; Worsley Building Leeds UK LS2 9JT