1. Division of Rehabilitation and Ageing, University of Nottingham, Nottingham NG7 2UH, UK
2. Health care of Older People, Nottingham University Hospitals NHS Trust, Queens Medical Centre, Nottingham NG7 2UH, UK
3. Division of Psychiatry, University of Nottingham, Nottingham NG7 2UH, UK
4. Mental Health Services for Older People, Nottinghamshire Healthcare NHS Trust, Queens Medical Centre, Nottingham NG7 2UH, UK