Novel citation-based search method for scientific literature: application to meta-analyses

Table 3 Retrieval of articles that had no direct connections to the known articles

Published meta-analysis	Number of articles without direct connections	Retrieved in:
Published meta-analysis	Number of articles without direct connections	All co-citations	All co-cited > 1	Frequently co-cited
Boothe [27]	1	1	1	1
Frolkis [16]	8	7	5	4
Oliver-Williams [28]	5	3	0	0
Knoll [17]	16	14	14	7
Stevanovic [29]	4	4	2	2
De Vries [30]	4	4	4	2
Crider [31]	1	1	1	1
Herretes [32]	0	0	0	0
Gharaibeh [33]	14	13	8	6
Gu [34]	2	2	2	1
Total	55	49	37	24

The table summarizes data presented in Additional file 1: Figure S1. For example, in the meta-analysis of Boothe et al. [27], only one article included in the meta-analysis had no direct connection with either of the two known studies. That article was frequently co-cited and was thus identified at any of the three thresholds

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