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Table 4 Systematic reviews that contributed most to the 'not retrieved articles’ in PubMed; performance of improved searches

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
Javan 68 29 61
Hasani 78 51 67
Verhoeven 89 67 81
Navarese 17 5 5
Novak 30 19 26
Gupta 16 8 12
Hardefeldt 26 18 23
  324 197 (61%) 275 (85%)