A protocol for a systematic review of non-randomised evaluations of strategies to improve participant recruitment to randomised controlled trials
Crossref DOI link: https://doi.org/10.1186/S13643-016-0308-3
Published: 2016-12
Update policy: https://doi.org/10.1007/SPRINGER_CROSSMARK_POLICY
Gardner, Heidi R.
Fraser, Cynthia
MacLennan, Graeme
Treweek, Shaun