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Statistical analysis

LJ Lixin Jiang
ZY Zengwu Yao
YZ Yifei Zhang
JH Jinchen Hu
DZ Dawei Zhao
HZ Huiyuan Zhai
XW Xixun Wang
ZZ Zhenbin Zhang
DW Dong Wang
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Statistical analysis was performed using IBM SPSS Statistics (Version 19.0; IBM Corp., New York, USA). We compared the differences between two groups using t-test, χ2 or Fisher's exact probability tests. The Kaplan-Meier method was used to calculate the survival rates, and log-rank tests were used to test for survival differences between the two groups. Two-tailed P<0.05 was considered statistically significant in all tests.

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