Received: 12 August 2019
Accepted: 11 December 2019
First Online: 23 December 2019
Ethics approval and consent to participate
: The University of Bath Research Ethics Advisory Committee approved this study on 22nd July 2016 (ref: EP 15/15 259/283). Written informed consent was gained from all participants prior to their enrolment into this study.
: Not applicable.
: Authors NBJ Vollaard and JA King report no conflict of interest however both are voluntary members of Nuffield Health’s External Research Advisory Board. Authors AQ Innes, G Thomson, M Cotter and BM Kelly report personal fees from Nuffield Health outside of the submitted work.