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Before you begin reviewing resources, your team should create a list of inclusion criteria that describes your ideal studies for your review. Typical criteria would include language, publication date, and type of study, along with specifics related to your research question (population, interventions, comparisons, outcomes).
Research question: Does the use of mirror therapy in lower limb stroke rehabilitation improve motor function, muscle tone, balance characteristics, functional ambulation, walking velocity, PROM and gait characteristics?
Example based on Broderick P., Horgan F., Blake C., Ehrensberger M., Simpson D., & Monaghan K. (2018). Mirror therapy for improving lower limb motor function and mobility after stroke: A systematic review and meta-analysis. Gait & Posture 63, 208-220. https://doi.org/10.1016/j.gaitpost.2018.05.017
With the broad searches required to capture all possible titles related to your review, search results may have lots of extraneous articles that are not pertinent to the topic and which will end up being eliminated. In addition, searching across multiple databases will bring back duplicate titles that will need to be eliminated from your total number.
PRISMA guidelines for scoping and systematic reviews have three rounds of elimination.
This step can be undertaken by an individual. It simply requires going through all found titles to remove duplicates.
Eliminate articles based on their title and abstract using your inclusion/exclusion criteria.
Eliminate articles based on the full text using your inclusion/exclusion criteria.
To reduce bias in the exclusion process, using a systematic review software like Rayyan can allow for blind judging of inclusion/exclusion.
After the above exclusion rounds, what you have left is commonly referred to as the "golden standard" -- those articles or book chapters that are a perfect fit for your review’s topic. Use these resources to make sure you've included every pertinent study on your topic.
Inspect the citation pages of all the sources in your golden standard. If the article is perfect for your needs, then it stands to reason that some of the articles the author used in their research might also be a perfect fit.
This process continues until the citations fall outside your specified date range.
If the article is great for your review, others may have also cited it, and their articles may also fit your review.
This process continues until no more "cited by" articles are added to your golden standard.