[1] Univ Sheffield, Sch Nursing & Midwifery, Sheffield S11 9NE, S Yorkshire, England
[2] Univ Sheffield, Sch Hlth & Related Res, Sect Publ Hlth, Sheffield S11 9NE, S Yorkshire, England
[3] Univ Bradford, Sch Hlth Studies, Bradford BD7 1DP, W Yorkshire, England
[4] Univ Auckland, Sch Nursing, Auckland 1, New Zealand
[5] Univ Lancaster, Inst Hlth Res, Int Observ End Life Care, Lancaster, England
[6] Honiton Grp Practice, Honiton, England
[7] Royal Devon & Exeter Hosp, Exeter EX2 5DW, Devon, England