Funding for this research was provided by:
Arthritis Research UK (18461)
Received: 11 December 2018
Accepted: 20 September 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: Ethical approval was obtained from The Research Ethics Committee 3 Wales (10/MRE09/28) within the Arthritis Research UK Biomechanics and Bioengineering Centre, Cardiff University, UK. Written informed consent was obtained from all participants.
: The participant, whose images are included in the additional file, provided full written consent for publication.
: The authors declare they have no competing interests.