1 Department of Rheumatology, Oxford University Hospitals NHS FT, Windmill Road, OX3 7LD, Oxford, UK. Shirish.dubey@ouh.nhs.uk.
2 Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Windmill Road, Oxford, OX3 7HE, UK. Shirish.dubey@ouh.nhs.uk.
3 Faculty of Medicine, Dentistry and Health, University of Sheffield, Beech Hill Road, Sheffield, S10 2RX, UK.
4 Barnsley Hospital NHS Foundation Trust, Gawber Road, Barnsley, S75 2EP, South Yorkshire, UK.