a decreasing trendp <0.0001
We observed a decreasing trend in clustering rate towards the end of 2020 after the onset of the COVID‐19 pandemic (fifth vs. third period: p <0.0001) (Figure 3 ).
We observed a decreasing trend in clustering rate towards the end of 2020 after the onset of the COVID‐19 pandemic (fifth vs. third period: p <0.0001) (Figure 3 ).