A systematic review attempts to collate all empirical evidence that fits pre-specified eligibility criteria in order to answer a specific research question. It uses explicit, systematic methods that are selected with a view to minimizing bias, thus providing more reliable findings from which conclusions can be drawn and decisions made.

The key characteristics of a systematic review are:
https://handbook-5-1.cochrane.org/chapter_1/1_2_2_what_is_a_systematic_review.htm
