[1] Univ Ulster, Inst Nursing Res, Coleraine BT52 1SA, Londonderry, North Ireland
[2] Univ Ulster, Sch Nursing, Coleraine BT52 1SA, Londonderry, North Ireland
[3] Univ Ulster, Inst Nursing Res, Newtownabbey, Antrim, North Ireland
[4] No Hlth & Social Care Trust, Newtownabbey, Antrim, North Ireland