Funding for this research was provided by:
Medical Research Council (MR/N000999/1)
NIHR CLAHRC-WM (N/A, N/A)
Received: 24 July 2018
Accepted: 10 October 2018
First Online: 20 October 2018
Ethics approval and consent to participate
: Ethical approval for this study was granted by the University of Warwick Biomedical Science Research Ethics Committee (Reference: REGO-2017-2099). Individual CHW consent to participate in this study was not required by the ethical review committee as it used previously collected data that were anonymised prior to analysis.
: Not applicable.
: RN is employed by <i>Living Goods.</i> The other authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.