1. M Gott (corresponding author): School of Nursing, Faculty of Medical and Health Sciences, University of Auckland, Level 2, Building 505, 85 Park Road, Grafton, Auckland, New Zealand;
2. School of Health and Related Research, University of Sheffield, Sheffield, UK
3. School of Nursing and Midwifery, University of Sheffield, Sheffield, UK
4. Notts, UK
5. Academic Unit of Supportive Care, Sykes House, Sheffield, UK