方法：采用横断面调查研究方法。

Methods: The method of cross sectional study was adopted.

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此研究是一个横断面调查。

This research is a cross-sectional investigation.

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方法：横断面调查研究。

Method: A cross-sectional study was conducted.

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方法：横断面调查研究。

Method: A cross-sectional study was conducted.

youdao