1. PRIME Centre Wales, Division of Population Medicine, School of Medicine, Cardiff University, Cardiff, UK
2. Marie Curie Palliative Care Research Centre, Division of Population Medicine, School of Medicine, Cardiff University, Cardiff, UK
3. Palliative and End of Life Care Research Group, Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
4. Marie Curie Hospice, Glasgow, UK
5. School of Dentistry, Cardiff University, Cardiff, UK
6. Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, UK
7. Marie Curie Palliative Care Research Centre, Division of Population Medicine, School of Medicine, Cardiff University, 8th Floor Neuadd Meirionydd, Heath Park Way, Cardiff CF14 4YS, UK