1. Academic Unit of Elderly Care and Rehabilitation, University of Leeds and Bradford Teaching Hospitals NHS Foundation Trust, Bradford, UK
2. Clinical Trials Research Unit, University of Leeds, Leeds, UK
3. Academic Unit of Psychiatry and Behavioural Sciences, Leeds Institute of Health, Sciences, University of Leeds, Leeds, UK
4. Institute of Psychiatry, King's College, London, UK
5. PSSRU, LSE, London, UK
6. Clinical Trials Research Centre, University of Liverpool, Liverpool, UK