[1] Newcastle Univ, Inst Neurosci, AGE Res Grp, Newcastle Upon Tyne, Tyne & Wear, England
[2] Newcastle Upon Tyne Hosp NHS Fdn Trust, NIHR Newcastle Biomed Res Ctr, Newcastle Upon Tyne, Tyne & Wear, England
[3] Newcastle Univ, Newcastle Upon Tyne, Tyne & Wear, England
[4] Univ Leeds, Acad Unit Elderly Care & Rehabil, Leeds, W Yorkshire, England
[5] Dalhousie Univ, Div Geriatr Med, Dept Med, Halifax, NS, Canada
[6] Newcastle Univ, Inst Hlth & Soc, Newcastle Upon Tyne, Tyne & Wear, England
[7] Bangor Univ, Sch Psychol, Bangor, Gwynedd, Wales
[8] Betsi Cadwaladr Univ Hlth Board, Llandudno Hosp, Llandudno, Wales