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Contributors AA, AMV and MD conceived the study. AA performed the data analysis. AA, AMV and MD critically appraised the manuscript and approved the final version.
Competing interests None declared.
Patient consent Obtained.
Ethics approval Nottinghamshire Research Ethics Committee-1.
Provenance and peer review Not commissioned; externally peer reviewed.
Data sharing statement Data used in this study are held in Academic Rheumatology, University of Nottingham, UK, under the custody of MD and can be made available on request.
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