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. Hospital Universitario 12 de Octubre, Madrid, Spain
4. Trauma Unit, University Hospital of Wales, Cardiff, UK
5. Golden Jubilee National Hospital, Clydebank, UK
6. National Office of Clinical Audit, Royal College of Surgeons in Ireland, University of Medicine and Health Sciences, Dublin, Ireland
7. Cork University Hospital, Cork, Ireland
8. Oxford Trauma and Emergency Care, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, University of Oxford, Oxford, UK