Funding for this research was provided by:
National Institute for Health Research (NA)
Received: 13 September 2019
Accepted: 10 March 2020
First Online: 18 May 2020
Ethics approval and consent to participate
: Ethical approval was not needed for this secondary analysis.
: Not applicable.
: EK, MA, SS, PE, KA and PB received grant and other funding from the NIHR Clinical Research Network. All other authors declare that they have no competing interests.