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Table 1 Limitations of current published research on the usability of Google Scholar for medical purposes

From: The comparative recall of Google Scholar versus PubMed in identical searches for biomedical systematic reviews: a review of searches used in systematic reviews

Limitations of research References
Not testing for systematic reviews [1316, 18, 2226]
Limited number of searches [1416, 2426]
Relevancy of results only determined by the authors [13, 14, 16, 23, 25, 26]
Not reviewing the first 1,000 hits in Google Scholar [15, 16, 18, 19, 21, 22]
Only using searches designed by the authors [1416, 21, 22]
Searches not comparable between the databases [15, 16, 23, 25]
Published more than five years ago [13, 14, 23, 24]
Only searching for known items [13, 14, 19]
Only looking at coverage, not retrieval [19]