1. University Hospital of Wales and School of Medicine, Cardiff University, Cardiff, UK
2. National Hip Fracture Database, Royal College of Physicians, London, UK
3. Golden Jubilee National Hospital, Clydebank, UK
4. Scottish Hip Fracture Audit, NHS National Services Scotland, Edinburgh, UK
5. College of Medicine & Veterinary Medicine, University of Edinburgh, Edinburgh, UK
6. School of Medicine, University of St Andrews, St Andrews, UK
7. Hospital Universitario 12 de Octubre, Madrid, Spain
8. Spanish National Hip Fracture Registry, Madrid, Spain
9. University Hospital of Wales, Cardiff, UK
10. Oxford Trauma and Emergency Care, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Oxford, UK