From: The comparative recall of Google Scholar versus PubMed in identical searches for biomedical systematic reviews: a review of searches used in systematic reviews
Number of included references
Number of includes retrieved by
Authors’ search
Improved search #1
Improved search #2
Hasani
78
26
37
Novak
30
10
12
Verhoeven
89
72
75
Navarese
17
6
13
16
Belsey
20
15
234
124 (53%)
141 (60%)
154 (66%)