Multivariate analysis was done by COX proportional hazard model.

多因素分析：COX比例风险模型。

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So it is very necessary to research the restricted multivariate regression model.

因此研究带约束的回归模型是十分必要的。

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So it is very necessary to research the restricted multivariate regression model.

因此研究带约束的回归模型是十分必要的。

youdao