[1] UCL, Dept Primary Care & Populat Hlth, London, England
[2] Kings Coll London, Social Care Workforce Res Unit, London, England
[3] Kings Coll London, Dept Psychol, London, England
[4] Univ Hertfordshire, Ctr Res Primary & Community Care, Hatfield, Herts, England
[5] Kingston Univ, Ctr Hlth & Social Care Res, London, England
[6] St Georges Univ London, London, England