1 Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS), University of Oxford, Oxford, UK; National Institute for Health Research (NIHR), Biomedical Research Centre, Oxford, UK. Electronic address: [email protected].
2 Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences (NDORMS), University of Oxford, Oxford, UK; National Institute for Health Research (NIHR), Biomedical Research Centre, Oxford, UK.
3 St George's University London, St George's University Hospitals NHS Foundation Trust, London, UK.