Including non-public data and studies in systematic reviews and systematic maps.

摘要: Systematic reviews and maps should be based on the best available evidence, reviewers make all reasonable efforts to source include potentially relevant studies. However, may not able consider existing since some data studies publicly available. Including non-public in provides a valuable opportunity increase systematic review/map comprehensiveness, mitigating negative impacts of publication bias. Studies for many reasons: still process being published (publication can take long time); due author/publisher restrictions; bias it difficult publish non-significant or results. Here, we what forms these implications including them maps. Reviewers carefully advantages disadvantages studies, weighing risks against benefits increased comprehensiveness. As with maps, must transparent about methods used obtain avoid their synthesis. We tentative suggestions situations where present an evidence base.