1. Department of Medicine for the Elderly, Hammersmith Hospital, London, UK
2. University College London Hospitals NHS Foundation Trust, London, UK
3. Institute of Inflammation and Ageing, University of Birmingham, UK
4. Department of Medicine, Dalhousie University, Halifax, Nova Scotia, Canada
5. Marie Curie Palliative Care Research Department, UCL Division of Psychiatry, London, UK
6. MRC Unit for Lifelong Health and Ageing at UCL, London, UK