At least 2 independent reviewers must read and separately make a decision on each abstract. In some cases, if a larger team is available, the results can be divided up between pairs of reviewers. Using a software/website specific for this purpose is helpful. Some are freely available online, like Rayyan. Others are paid software, like Covidence. Covidence does give each individual one free review, so researchers should consider this option.
Each reviewer must individually, without influence of another, decide if each abstract should be included (Yes), excluded (NO), or needs further examination of full-text or discussion (Maybe).
The decisions of the paired reviewers should be compared when completed.
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