1. Leeds Institute of Rheumatic and Musculoskeletal Medicine, University of Leeds, Leeds, UK
2. NIHR Leeds Biomedical Research Centre, Leeds Teaching Hospitals NHS Trust, Leeds, UK
3. Rheumatology Institute of Lucania (IReL), Rheumatology Department of Lucania, San Carlo Hospital of Potenza and Madonna delle Grazie Hospital of Matera, Potenza, Italy
4. Department of Experimental and Clinical Medicine, Division of Rheumatology, University of Florence, Florence, Italy
5. Department of Rheumatology, University of Paris Descartes, Paris, France
6. Division of Rheumatology, Fondazione Policlinico Universitario Agostino Gemelli, Rome, Italy
7. Department of Rheumatology, University College London, Royal Free Hospital, London, UK
8. Department of Rheumatology, University Hospital Zurich, Zurich, Switzerland
9. NIHR Diagnostic Evidence Co-operative, Leeds Teaching Hospitals NHS Trust, Leeds, UK