1. Department of HCOP, Nottingham University Hospitals NHS Trust, Nottingham, United Kingdom
2. The Centre for Spinal Studies and Surgery, Nottingham University Hospitals NHS Trust, Nottingham, United Kingdom
3. University of Nottingham, Nottingham, United Kingdom
4. National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre (BRC), Nottingham, United Kingdom
5. Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia