A Systematic Review (SR) is "a literature review focused on a specific research question, which uses explicit methods to minimize bias in the identification, appraisal, selection, and synthesis of all the high-quality evidence pertinent to the question." Source: Online Dictionary of Library and Information Science
Note: "Statistical methods to synthesize the results of the included studies (meta-analysis) may or may not be used in the process." (EFSA, 2015). In other words, not all systematic reviews have meta-analysis. Systematic reviews are not all created equal.
A Systematic Review includes
Sources: http://handbook.cochrane.org/ https://archive.org/details/CochraneSystematicReviewsGIFs
Pyramid of Evidence-Based Practice used in classifying levels of literature. Highest levels help in identifying the most effective interventions/treatment when answering research questions.
Source: http://www.samhsa.gov/co-occurring/topics/training/Evidence-BasedPractices%28OP6%29.pdf