1. Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK;
2. Oxford University Clinical Academic Graduate School (OUCAGs), University of Oxford, Oxford, UK;
3. Tees, Esk and Wear Valleys Foundation NHS Trust, Durham, UK;
4. The Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS), The University of Oxford, Oxford, UK;
5. Geneva University Hospitals, Geneva, Switzerland;
6. Oxford Health NHS Foundation Trust and Oxford University, Oxford, UK