1. Research Department of Clinical, Educational and Health Psychology, University College London, London, UK
2. Marie Curie Palliative Care Research Department, Division of Psychiatry, University College London, London, UK
3. Marie Curie Palliative Care Research Department, Division of Psychiatry, University College London, London, UK; Department of Psychological Medicine, Royal London Hospital, East London NHS Foundation Trust
4. Marie Curie Palliative Care Research Department, Division of Psychiatry, University College London, London, UK; Division of Psychiatry, University College London, London, UK
5. Division of Psychiatry, University College London, London, UK
6. Marie Curie Palliative Care Research Department, Division of Psychiatry, University College London, London, UK; Department of Psychiatry, Faculty of Medicine, Prince of Songkla University, Thailand
7. Marie Curie Palliative Care Research Department, Division of Psychiatry, University College London, London, UK; National Ageing Research Institute, Parkville, Victoria, Australia