1. Edge Hill College School of Health Studies, University Hospital Aintree, Longmore Lane, Liverpool, L9 7AL, UK and Marie Curie Senior Research Fellow at Marie Curie Centre, Liverpool
2. Marie Curie Centre, Speke Road, Woolton, Liverpool, L25 8QA, UK
3. Royal Liverpool University Hospital, Longmore Lane, Liverpool, L9 7AL, UK
4. Marie Curie Centre, Speke Road, Woolton, Liverpool, L25 8QA, UK, and Consultant in Palliative Medicine/Honorary Senior Lecturer, Royal Liverpool University Hospital, Liverpool, UK