Continuous variables were normally distributed and assessed using the Shapiro-Wilk test, and expressed as means±standard deviations, while those with non-normal distribution were expressed as median (interquartile range). Dichotomous variables were expressed as frequencies (percentages). To compare data between the groups, the Student`s T-test (Unpaired T-test) for continuous variables, the Mann-Whitney test for non-continuous data, and the Chi-Square test (Fisher, as appropriate) for dichotomous data were used. The McNemar test was used for paired categorical analysis. Kaplan-Meyer survival curves were constructed and compared using the Log-rank test. Conditional survival was assessed by limiting the group of patients analyzed to those who have survived to at least 1 year. The entire analysis was performed using STATA 12.0 (College Station, Texas, USA). Graphs were constructed with GraphPad 5.0 (La Jolla, California, USA). In this study, a p value < 0.05 was considered statistically significant.

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