SETTINGS:Occupational medicine department of a disease control and prevention center of a city.

单位：一所市级疾病预防控制中心的职业医学科。

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SETTING: Center for Disease Prevention and Control of Xuzhou.

单位：徐州市疾病预防控制中心。

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SETTING: Center for Disease Prevention and Control of Xuzhou.

单位：徐州市疾病预防控制中心。

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