Additional file 1.

Box; Table S1; Table S2 (a, b and c). - Box: search strings employed in the different searching strategies: Google Scholar 1 (GS1); Google Scholar 2 (GS2); PubMed 1(PM1); PubMed 2 (PM2). - Table S1: Sensitivity, specificity and precision of the different sources of citations/search strategies; - Table S2: Two by two table displaying the papers shared by pairs of bibliographic sources.

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Mastrangelo et al. BMC Research Notes 2010 3:131   doi:10.1186/1756-0500-3-131