Methods Random sampling investigation was carried out by self-administering and anonymous questionnaire among college students in Henan.
方法采用不记名自填问卷方式，对河南在校大学生进行随机抽样调查。
Methods Random sampling investigation was carried out by self-administering and anonymous questionnaire among college students in Henan.
方法采用不记名自填问卷方式，对河南在校大学生进行随机抽样调查。
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