All statistical analyses were performed using SPSS software package version 16.0 (SPSS Inc., Chicago, IL, USA). Paired t tests were used to assess the significance of the difference between the preoperative, 1-month postoperative and 3-month postoperative scores. The Kaplan–Meier method was used to estimate local control rates and overall survival rates. The log–rank test was used to compare the factors affecting local control. A p value < 0.05 was considered statistically significant.

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