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The study duration was divided into three distinct periods. Normally distributed demographic and surgical intervention characteristics during the three study periods were compared using a two-way T-test. Non-normally distributed and cross-tabulation data were compared using the Mann-Whitney and Pearson's chi-squared test, respectively. Statistical significance was set at P-value < 0.05. Statistical analyses were performed using Stata 14 statistical software (StataCorp, College Station, Texas).
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