The SPSS 21.0 statistical package was used to process the data of the study. Firstly, the 1-sample Kolmogorov-Smirnov test was performed to verify the normal distribution of the quantitative variables. And then normally distributed data were expressed as mean ± SD, while the quantitative data of abnormal distribution were expressed as median (25-75th percentile). And qualitative data were expressed as a ratio (or percentage). The independent samples t-tests, Mann-Whitney U test, or chi-square test was used to explore the difference between the two groups. The Pearson (or Spearman) correlation analysis and multiple linear regression analysis were used to evaluate the association between the indicators. Two-tailed P values less than 0.05 were regarded as statistically significant.

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