[1] Univ Cent Lancashire, Dept Nursing, Preston PR1 2HE, Lancs, England
[2] Univ Cent Lancashire, Lancashire Sch Hlth & Postgrad Med, Preston PR1 2HE, Lancs, England
[3] Univ Leeds, Acad Unit Elderly Care & Rehabil, Leeds, W Yorkshire, England
[4] Univ Glasgow, Acad Sect Geriatr Med, Glasgow, Lanark, Scotland
[5] Northumbria Healthcare NHS Trust, N Shields, England