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Network of eligible comparisons for the mixed-treatment comparison meta-analysis. (A) islet equivalent number (IEQ)/g pancreas; (B) Viability; (C) Purity; (D) stimulation index (SI). Lines connect the enzymes that have been studied in head-to-head (direct) comparisons. The width of the lines represents the cumulative number of studies for each comparison, and the size of each node is proportional to the sample size.
