A protocol for a systematic review of non-randomised evaluations of strategies to increase participant retention to randomised controlled trials.

Moreover, we think that the systematic evaluation of what is expected to be a considerable amount of research is crucial (chiefly because without collecting and critically analysing these studies, they are currently disregarded), worthwhile (as there might be significant unknown effects), and will provide tangible results for the trials stakeholders regardless of whether the outcomes support one or more interventions.

also in 2,435 other papers