1. Department of General Surgery, Ashford and St Peter’s Hospitals NHS Foundation Trust, Chertsey, UK
2. Warwick Clinical Trials Unit, Warwick Medical School, University of Warwick, Coventry, UK
3. Department of Plastic Surgery, Stoke Mandeville Hospital, Aylesbury, UK
4. Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Science, University of Oxford, Nuffield Orthopaedic Centre, Oxford, UK