Revisión sistemática: el más alto nivel de evidencia

The systematic review is a publication of secondary source, that is, it summarizes the information of primary articles, however it is necessary that the elaboration process is described in a transparent and understandable way, from the collection of articles, the criteria of the articles and the analysis of the results, to make it systematic. We can make a review of a topic without it being systematic, the difference is always the degree of evidence, the meta-analysis is the statistical analysis of two or more studies, these articles do not come from a systematic review, nor do all systematic reviews have meta-analysis. Systematic review is a scientific investigation that attempts to answer a research question. The elaboration process can be divided into simple stages, but it is important to show what was done in the study as well as the search dates. 1. Define the research question, 2. Establish eligibility criteria, 3. Establish the search strategy, 4. Analyze the bias and the results of the chosen studies, and 5. Interpretation and presentation of the results.