[1] UCL, Res Dept Primary Care & Populat Hlth, Ctr Ageing Populat Studies, Upper 3rd Floor,Royal Free Campus,Rowland Hill St, London W3 2PF, England
[2] UCL, Div Psychiat, Marie Curie Palliat Care Res Dept, London, England
[3] Prince Songkla Univ, Dept Psychiat, Fac Med, Hat Yai, Thailand
[4] Natl Ageing Res Inst, Melbourne Ageing Res Collaborat, Melbourne, Vic, Australia
[5] UCL, Div Psychol & Language Sci, Language & Cognit, London, England
[6] North Middlesex Univ Hosp, Barnet Enfield & Haringey Mental Hlth Trust Liais, Edmonton, England
[7] Kings Coll London, NIHR Hlth & Social Care Workforce Res Unit, London, England
[8] Kings Coll London, NIHR Appl Res Collaborat ARC South London, London, England