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The field of handedness is overrun by the amount of published studies.This vast quantity of studies makes it taxing for scientists to distil the knowledge the results carry; even more so when findings are confusing and conflicting. Literature reviews could never hope to handle such an abundance of data. Meta-analysis, by contrast, is a statistical method allowing for the integration and summarizing of the findings from a body of research in a clear, objective way. Meta-analysis further allows for the investigation of the presence of publication bias. Importantly, meta-analysis allows for the assessment of any systematic variation among the results of different studies and, moreover, for the investigation of the sources of any such variance. This is a series of meta-analyses in the field of handedness.