[1] UCL, Res Dept Primary Care & Populat Hlth, Ctr Ageing Populat Studies, London, England
[2] UCL, Sch Pharm, Res Dept Practice & Policy, London, England
[3] Univ Coll London Hosp NHS Fdn Trust, Ctr Med Optimisat Res & Educ, London, England
[4] Kings Coll London, NIHR Appl Res Collaborat ARC South London, London, England
[5] Kings Coll London, NIHR Policy Res Unit Hlth & Social Care Workforce, London, England
[6] UCL, UCL Sch Pharm, Dept Pharmaceut Res, London, England
[7] UCL, Dept Clin & Movement Neurosci, London, England
[8] UCL, Res Dept Primary Care & Populat Hlth, PRIMENT Clin Trials Unit, London, England