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Continuous variables were expressed as mean ± standard deviation (SD) as appropriate. Chi-squared and t-tests were used to compare differences between two groups. The accuracy of the prognostic nomogram was assessed by the AUC values of ROC curves using the package “survivalROC” in R. Statistical analyses were performed with R software (version 3.6.1, http://www.r-project.org/).
Copyright and License information: ©2021 Ma et al.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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