1. Brighton and Sussex University Hospitals NHS Trust; Brighton East Sussex UK
2. Anaesthesia and Critical Care Section; Division of Clinical Neuroscience; University of Nottingham; Queen's Medical Centre Campus; Nottingham University Hospitals NHS Trust; Nottingham UK
3. Peterborough and Stamford Hospitals NHS Trust; Peterborough UK
4. National Hip Fracture Database, Falls and Fragility Fracture Audit Programme; Clinical Effectiveness and Evaluation Unit; Royal College of Physicians; London UK
5. The Royal National Orthopaedic Hospital; Stanmore Middlesex UK
6. Gloucestershire Royal Hospital; Gloucester Gloucestershire UK
7. Association of Anaesthetists of Great Britain and Ireland; London UK
8. King Fahad Medical City; Riyadh Saudi Arabia
9. National Hip Fracture Database; London UK
10. Anaesthesia and Critical Care Medicine; University of Southampton and Southampton NIHR Respiratory Biomedical Research Unit; Southampton UK