A protocol for a systematic review of non-randomised evaluations of strategies to improve participant recruitment to randomised controlled trials
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Gardner , H R , Fraser , C , MacLennan , G & Treweek , S 2016 , ' A protocol for a systematic review of non-randomised evaluations of strategies to improve participant recruitment to randomised controlled trials ' Systematic reviews , vol 5 , 131 . , 10.1186/s13643-016-0308-3
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