Funding for this research was provided by:
National Institute for Health Research (Research on Research programme)
Received: 5 February 2021
Accepted: 1 February 2022
First Online: 4 March 2022
: Not applicable.
: Not applicable. All authors consent to publish.
: All the authors are employed by the Wessex Institute, University of Southampton to work for the NIHR Evaluation, Trials and Studies Coordinating Centre (NETSCC) at the time when the study was conducted.