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Contributors DP conceived the study, designed the study, cleaned the data, performed statistical analysis and drafted and revised the manuscript. II cleaned the data, performed statistical analysis and drafted and revised the manuscript. JH, IM, TM, SVe, DS and SVi designed the study and drafted and revised the manuscript. AB conceived the study, designed the study, designed the data collection tools, monitored data collection and drafted and revised the manuscript. AB is the guarantor. All authors have read and approved the final manuscript for publication.
Funding This work was funded by a core programme grant from Arthritis Research UK (grant ref: 20385) and by the National Institute for Health Research Manchester Musculoskeletal Biomedical Research Unit.
Disclaimer The views expressed are those of the authors’, and not necessarily those of the NHS, the NIHR or the Department of Health.
Competing interests None declared.
Ethics approval Norwich Local Research Ethics Committee.
Provenance and peer review Not commissioned; externally peer reviewed.