Funding for this research was provided by:
Medical Research Council (G1002325)
Received: 30 June 2021
Accepted: 4 August 2021
First Online: 23 September 2021
: The START programme of recruitment strategies was approved by the National Research Ethics Service (NRES) Committee, Yorkshire and the Humber – South Yorkshire (Ref: 11/YH/0271) on 5 August 2011. Host trials had their own approvals.
: Not applicable
: ST was a grant-holder for the ECLS study, in which one of the SWAT evaluations was run. The other authors declare that they have no competing interests.