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Flowchart of the study selection strategy used for miRNA ranking in four biosamples: breast tissue, breast milk, plasma and serum. Adapted from Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines [39]. Detailed flowcharts are shown in Supplementary Methods. The total number of women included in the selected studies per sample type was added underneath. a. One article provided data for the breast milk miRNA ranking and for the plasma miRNA ranking.
