Statistical analysis
Statistical analysis was performed using IBM SPSS Statistics for
Windows, Version 23.0 (IBM Corp., Armonk, NY). The normality assumptions
were controlled by the Shapiro–Wilk test. Descriptive analyses were
presented using mean±SD (range), median (range), or n (%), where
appropriate. Categorical data were analyzed by Pearson chi-square or
Fisher’s Exact test. Mann–Whitney U test and Student’s t-test were used
for the analysis of non-normally and normally distributed numerical
data, respectively. A p-value of less than 0.05 was considered
statistically significant.