Statistical analyses
Statistical analyses were performed using the SPSS software version 25. The variables were investigated using visual (histograms, probability plots) and analytical methods (Kolmogorow-Simirnov/Shapiro-Wilk’s test) to determine whether they are normally distributed or not. Descriptive analyses were presented using means and standard deviations for normally distributed variables. Comparisons were made using the t test, chi-square test, Fisher’s exact test, and analysis of variance. Variables that are found to be significant (p < 0.05) in univariate analysis were tested in multivariate analysis, which was performed using a stepwise logistic regression model. Values of p < 0.05 were considered statistically significant. Survival analyses were made using Kaplan-Meier test.