1Medical School, University of Leicester, George Davies Centre, Lancaster Rd, Leicester, UK
2Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
3Department for Healthcare of Older People, Queens Medical Centre, Nottingham University Hospital NHS Trust, Nottingham, UK
4The Centre for Spinal Studies and Surgery, Queens Medical Centre, Nottingham University Hospital NHS Trust, Nottingham, UK
5Division of Rehabilitation, Ageing and Wellbeing, University of Nottingham, Nottingham, UK
6National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre (BRC), Nottingham, UK