El Feky, AdelGillies, KateGardner, Heidi RebeccaFraser, CynthiaTreweek, Shaun2018-02-222018-02-222018-02-20El Feky, A, Gillies, K, Gardner, H R, Fraser, C & Treweek, S 2018, 'A protocol for a systematic review of non-randomised evaluations of strategies to increase participant retention to randomised controlled trials', Systematic reviews , vol. 7, 30. https://doi.org/10.1186/s13643-018-0696-72046-4053ORCID: /0000-0001-7890-2854/work/79060625ORCID: /0000-0002-2796-6898/work/118192885ORCID: /0000-0002-7239-7241/work/186968581http://hdl.handle.net/2164/10069This work is part of AE’s PhD which is funded by the University of Aberdeen Elphinstone Scholarship. The Health Services Research Unit, University of Aberdeen receives core funding from the Chief Scientist Office of the Scottish Governoment Health Directorates. The funder had no role in the protocol development.413897engR Medicine (General)R1Journal article10.1186/s13643-018-0696-77