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Patients’ age was tested for normality using the one-sample Kolmogorov-Smirnov test, and the Kruskal-Wallis test were used to compare the median of each group. Discrete variables were examined using Mantel-Haenszel chi-square tests and Fisher's exact tests to obtain P values. SPSS statistical software version 17.0 (SPSS Inc. Chicago, IL, USA) was used to analyze the data. Statistical significance was assessed by two-tailed tests with α level of 0.05.
Copyright and License information: ©2017 Fan et al.
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY), which permits unrestricted use and redistribution provided that the original author and source are credited.
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