Identifying and removing duplicate records from systematic review searches
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Updated: Mar 31, 2026

Comparing Bibliometric Analysis Using PubMed, Scopus, and Web of Science Databases
Published on: October 24, 2019
Objective:
The purpose of this study was to compare effectiveness of different options for de-duplicating records retrieved from systematic review searches.
Methods:
Using the records from a published systematic review, five de-duplication options were compared. The time taken to de-duplicate in each option and the number of false positives (were deleted but should not have been) and false negatives (should have been deleted but were not) were recorded.
Results:
The time for each option varied. The number of positive and false duplicates returned from each option also varied greatly.
Conclusion:
The authors recommend different de-duplication options based on the skill level of the searcher and the purpose of de-duplication efforts.
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