“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 (Antman 1992, Oxman 1993).”
What is a systematic review? (2011). In J. Higgins & S. Green (Eds.), Cochrane Handbook for Systematic Reviews of Interventions (Version 5.1.0 ed.): The Cochrane Collaboration. Retrieved from http://handbook-5-1.cochrane.org/.