PRISMA 2020 specifies the following as essential elements:
Review authors are strongly encouraged to include a study flow diagram as recommended by the PRISMA statement (Liberati 2009)
-- Chapter 4.5, Cochrane Handbook 2019
Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) are reporting guidelines for systematic reviews and meta-analyses. Often journals will ask your to report your systematic review results using PRISMA or another relevant reporting guideline. Find out more:
PRISMA 2020 resources
PRISMA 2009 RESOURCES
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‘Specify all databases, registers, websites, organisations, reference lists, and other sources searched or consulted to identify studies. Specify the date when each source was last searched or consulted.’ p.5
‘Present the full search strategies for all databases, registers, and websites, including any filters and limits used.’ p. 6
‘Describe the results of the search and selection process, from the number of records identified in the search to the number of studies included in the review, ideally using a flow diagram.’ p. 18
- PRISMA 2020 Explanation and Elaboration
There are several reporting guidelines available, including Consort, Moose, and Strobe.