[1] Ulster Univ, Inst Nursing & Hlth Res, Newtownabbey, North Ireland
[2] Ulster Univ, Sch Nursing, Newtownabbey, North Ireland
[3] Ulster Univ, Inst Nursing & Hlth Res, Londonderry, North Ireland
[4] Ulster Univ, Sch Nursing, Londonderry, North Ireland
[5] Univ Lancaster, Div Hlth Res, Int Observ End Life Care, Lancaster, England