1. Marie Curie Palliative Care Research Department, Division of Psychiatry, University College London, London, UK
2. Barnet Enfield and Haringey Mental Health Trust Liaison Psychiatry Team, North Middlesex University Hospital, London, UK
3. Division of Psychiatry, University College London, London, UK
4. The Bamford Centre for Mental Health and Wellbeing, Ulster University, Coleraine, UK
5. Department of Primary Care and Population Health, University College London, London, UK
6. Department of Statistical Science, University College London, London, UK