1 Academic Unit of Palliative Care, Leeds Institute of Health Sciences, University of Leeds, Leeds, West Yorkshire, UK.
2 School of Healthcare, University of Leeds, Leeds, West Yorkshire, UK.
3 Patient Reported Outcomes Group, St James's Institute of Oncology, Leeds Institute of Cancer and Pathology, University of Leeds, Leeds, West Yorkshire, UK.
4 Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, West Yorkshire, UK.