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Network meta‐analysis of different types of facemask compared with control (no mask or very low frequencies) for influenza virus infections. Risk of laboratory‐confirmed infection by influenza virus in (a) overall, (b) RCTs and (c) observational studies. Effect estimates are presented in odds ratios with 95% confidence interval. Facemasks are ranked by surface under the cumulative ranking curve value. RCT, randomized controlled trial
