Methods: Epidemiological survey of tuberculosis was conducted by cluster random sampling in the elderly in rural area.
方法：采取整群随机抽样方法，对本市农村地区老年人群进行结核病流行病学抽样调查。
Methods: Epidemiological survey of tuberculosis was conducted by cluster random sampling in the elderly in rural area.
方法：采取整群随机抽样方法，对本市农村地区老年人群进行结核病流行病学抽样调查。
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