硒及年龄、性别、文化程度、职业等因素对山东省农村老年人认知能力的影响
서급년령、성별、문화정도、직업등인소대산동성농촌노년인인지능력적영향
The influences of selenium, age, sex, education level, occupation and other factors on cognitive function in elderly of rural areas in Shandong Province
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