1. Department of Trauma and Orthopaedic Surgery, University College London Hospitals NHS Foundation Trust, London, UK
2. Barts and The London School of Medicine and Dentistry, School of Medicine London, London, UK
3. Division of Surgery and Interventional Science, University College London, London, UK
4. Wellcome / EPSRC Centre for Interventional and Surgical Sciences, University College London, London, UK