1. School of Nursing and Midwifery, University of Southampton, Highfield, Southampton, SO20 1BJ
2. Academic Palliative Medicine Unit, University of Sheffield, Trent Palliative Care Centre, Little Common Lane, Abbey Lane, Sheffield, S11 9NE
3. Department of Epidemiology and Public Health, London School of Hygiene and Tropical Medicine, Keppel St, London, WC1A 7H6