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Number of weekly procedures 8 weeks before and 8 weeks after March 16, 2018, March 16, 2019, and March 16, 2020, respectively. Significance levels of the comparison within a year are shown above and comparison of the ‘after’ period between 2018 and 2019 with 2020 are shown below the boxplots. Comparisons between groups were done using a Wilcoxon–Mann–Whitney test. **p < 0.01
