1 Primary Care Unit, Department of Public Health and Primary Care, University of Cambridge, Cambridge, UK.
2 Marie Curie Palliative Care Research Department, Division of Psychiatry, University College London, London, UK.
3 Policy & Rehabilitation, Cicely Saunders Institute of Palliative Care, King's College London, London, UK.
4 Sussex Community NHS Foundation Trust, Brighton General Hospital, Brighton, UK.
5 Academic Centre for Healthy Ageing, Whipps Cross Hospital, Barts Health NHS Trust & Centre for Psychiatry and Mental Health, Wolfson Institute of Population Health, Queen Mary University of London, London, UK.