El Feky, AdelGillies, KatieGardner, HeidiFraser, CynthiaIshaku, TimothyTreweek, Shaun2020-09-302020-09-302020-09-29El Feky, A, Gillies, K, Gardner, H, Fraser, C, Ishaku, T & Treweek, S 2020, 'Non-randomised evaluations of strategies to increase participant retention in randomised controlled trials : A systematic review', Systematic reviews , vol. 9, 224, pp. 1-13. https://doi.org/10.1186/s13643-020-01471-x2046-4053ORCID: /0000-0001-7890-2854/work/81232121ORCID: /0000-0002-2796-6898/work/118192875ORCID: /0000-0002-7239-7241/work/186968405https://hdl.handle.net/2164/1518213801633engRandomised trialsRetention strategiesDrop-outsNon-randomised evaluationsParticipant retentionTELEPHONEQUALITYQUESTIONNAIRE RESPONSEREMINDERSFOLLOW-UPGRADEPOSTAL QUESTIONNAIRESR MedicineMedicine (miscellaneous)Supplementary DataRNon-randomised evaluations of strategies to increase participant retention in randomised controlled trials : A systematic reviewJournal article10.1186/s13643-020-01471-xhttp://www.scopus.com/inward/record.url?scp=85092387235&partnerID=8YFLogxK9