The PRISMA 2020 statement: an updated guideline for reporting systematic reviews
The PRISMA 2020 27-item checklist, an expanded checklist that details reporting recommendations for each item, the PRISma 2020 abstract checklist, and the revised flow diagrams for original and updated reviews are presented.
Abstract
[Extract]<br/>Systematic reviews serve many critical roles. They can provide syntheses of the state of knowledge in a field, from which future research priorities can be identified; they can address questions that otherwise could not be answered by individual studies; they can identify problems in primary research that should be rectified in future studies; and they can generate or evaluate theories about how or why phenomena occur. Systematic reviews therefore generate various types of knowledge for different users of reviews (such as patients, healthcare providers, researchers, and policy makers) [1, 2]. To ensure a systematic review is valuable to users, authors should prepare a transparent, complete, and accurate account of why the review was done, what they did (such as how studies were identified and selected) and what they found (such as characteristics of contributing studies and results of meta-analyses). Up-to-date reporting guidance facilitates authors achieving this [3].