[1] Univ Leeds, Acad Unit Elderly Care & Rehabil, Bradford, W Yorkshire, England
[2] Bradford Inst Hlth Res, Acad Unit Elderly Care & Rehabil, Bradford, W Yorkshire, England
[3] Univ Leeds, Leeds Inst Hlth Sci, Leeds, W Yorkshire, England
[4] Bradford Teaching Hosp NHS Fdn Trust, Bradford Inst Hlth Res, Bradford, W Yorkshire, England
[5] Kings Coll London, Dept Primary Care & Publ Hlth Sci, London, England
[6] Univ Leeds, Clin Trials Res Unit, Leeds, W Yorkshire, England