1. a Research Department of Primary Care & Population Health , RFUCLMS , London, UK
2. b Dental Health Services Research Unit , Dundee, UK
3. c Department of Psychology , St John's Hospital , Livingston, UK
4. d Department of Psychology , University of Stirling , UK
5. e The University of Manchester/Bolton, Salford and Trafford Mental Health NHS Trust, School of Nursing, Midwifery and Social Work , Manchester, UK
6. f Social Care Institute for Excellence , London, UK
7. g Division of Dementia Studies , Bradford Dementia Group, School of Health Studies, University of Bradford , Bradford, UK