Funding for this research was provided by:
National Institute for Health Research (CRF-2016-10043, IS-BRC-1215-20007)
Wellcome Trust (207028/Z/17/Z)
Received: 4 April 2019
Accepted: 12 August 2019
First Online: 21 October 2019
Ethics approval and consent to participate
: Not Applicable
: Consent for publication has been obtained.
: The authors declare that they have no competing interests.