https://www.selleckchem.com/pr....oducts/rbn013209.htm
Poor retention of participants in randomised trials can lead to missing outcome data which can introduce bias and reduce study power, affecting the generalisability, validity and reliability of results. Many strategies are used to improve retention but few have been formally evaluated. To quantify the effect of strategies to improve retention of participants in randomised trials and to investigate if the effect varied by trial setting. We searched the Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE, Scopus, PsycINFO,
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