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. 2020 Jul 15;25(4):401–411. doi: 10.1007/s10151-020-02297-4

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© The Author(s) 2020, corrected publication 2020

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Fig. 3 — Type of Personal Protective Equipment (PPE) used when performing appendicectomy by week of the study. FFP3 mask (blue), standard surgical mask (red), none (green), and other (orange)