A bibliographic entry from a database. This would include things like the title and abstract of a potential article.
The published document associated with a study. This could take the form of a full-text article.
The research investigation itself. It is the original research that is described in a report. It is important to remember that one study can have multiple reports associated with it.
Preferred Reporting Items for Systematic reviews and Meta-Analyses, or PRISMA, is an evidence-based minimum set of items to help authors improve the reporting of systematic reviews and meta-analyses. PRISMA is part of a broader effort, to improve the reporting of different types of health research, and in turn to improve the quality of research used in decision-making in healthcare.
More information on PRISMA can be found here: http://www.prisma-statement.org/
Authors are advised to read the PRISMA 2020 statement paper in conjunction with the explanation and elaboration paper.
The PRISMA 2020 statement comprises a checklist of items and sub-items, and an expanded checklist that details reporting recommendations for each item/sub-item:
An extension for PRISMA that was created specifically for reporting literature searches:
The flow diagram depicts the flow of information through the different phases of a systematic review. It maps out the number of records identified, included and excluded, and the reasons for exclusions. Different templates are available depending on the type of review (new or updated) and sources used to identify studies.