[1] Univ London London Sch Econ & Polit Sci, Personal Social Serv Res Unit, London WC2A 2AE, England
[2] Univ Surrey, Dept Psychol, Guildford GU2 5XH, Surrey, England
[3] Kings Coll London, Ctr Econ Mental Hlth, Inst Psychiat, London WC2R 2LS, England
[4] Early Onset Dementia Penn Hosp, Wolverhampton, W Midlands, England
[5] Memory Clin, Wolverhampton, W Midlands, England