A systematic review of non-randomised evaluations of strategies to improve participant recruitment to randomised controlled trials : [version 1; peer review: awaiting peer review]

Heidi Gardner was supported by a PhD scholarship from the University of Aberdeen’s Development Trust. Katie Gillies was supported by an MRC Methodology Research Fellowship [MR/L01193X/1], and Shaun Treweek was supported by core funding from the University of Aberdeen.Peer reviewedPublisher PD