1. University College London; Centre for Ageing Population Studies, Research Department of Primary Care and Population Health; Rowland Hill Street London UK NW3 2PF
2. St George's, University of London; Medical School; Cranmer Terrace London UK SW17 0RE
3. University College London; Marie Curie Palliative Care Research Department, Division of Psychiatry; 6th Floor, Maple House 149 Tottenham Court Road London UK W1T 7NF
4. University College London; Division of Psychology and Language Sciences; London UK
5. King's College London; NIHR Health and Social Care Workforce Research Unit, The Policy Institute; Strand London UK WC2 6LB