Funding for this research was provided by:
Versus Arthritis (20172)
Received: 6 November 2019
Accepted: 13 May 2020
First Online: 3 July 2020
Ethics approval and consent to participate
: Ethical approval was obtained from the NHS Health Research Authority (NRES Committee London, Stanmore, REC reference number: 13/LO/0793). All participants in this study provided informed written consent.
: Not applicable.
: The authors declare that they have no competing interests.