1. Department of Palliative Care, Policy & Rehabilitation, King's College London, London, United Kingdom.
2. Department of Palliative Medicine, Addenbrookes Hospital Cambridge, Cambridge University Teaching Hospitals NHS Foundation Trust Cambridge, United Kingdom.
3. Barcelona Centre for International Health Research, Universitat de Barcelona, Barcelona, Spain.
4. Interdisciplinary Centre for Palliative Medcine, Munich University, Munich, Germany.