Continuous variables are presented as means ± standard deviations (SDs), and categorical data are presented as numbers and percentages (%). Statistical comparisons within group will be performed by paired t test, between the groups are tested using the chi-square test for categorical variables, and the Wilcoxon rank-sum test for continuous variables. Long-term successful results are compared using Kaplan-Meier analyses. Statistical assessments are considered significant when p < 0.05. Statistical analyses will be performed using SPSS 15.0 statistical software (SPSS Inc., Chicago, IL).