Data analysis
Continuous variables were tested for normal distribution using histogram analysis. Data with a normal distribution are presented as the mean ± standard deviation. Data without a normal distribution are presented as the median and interquartile range (IQR). Categorical variables are expressed as the number and ratio. The chi-square test was used to compare categorical variables. Two-tailed P < 0.05 was considered statistically significant. All statistical analyses were performed using IBM SPSS statistics version 25 (IBM Inc., Armonk, NY, USA).