The data were inputted into Excel 2016 to establish the database, and Stata 15.1 (Stata Corporation, College Station, TX, US) software was used for PSM and other statistical analysis. The continuous variables accord with normal distribution were described by the means with standard deviation (SD), and non-normal distribution data were defined by the medians with interquartile range (IQR). The difference between groups was compared with the t test or Wilcoxon rank test. The categorical variables were described by frequencies and percentages, and the comparisons between the groups were conducted by a Chi-Squared test or Fisher exact probability method. Statistical significance was observed at an α level of 0.05.

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