Funding for this research was provided by:
Medical Research Council (G9900220)
Arthritis Research UK (18174)
Received: 28 June 2019
Accepted: 12 September 2019
First Online: 27 October 2019
Ethics approval and consent to participate
: The study was approved by North Staffordshire Local Research Ethics Committee (project no. 1430), and all participants provided written informed consent.
: Not applicable.
: Michelle Marshall is an Associate Editor for BMC Musculoskeletal Disorders. The authors have no other conflicts of interest to declare.