Methods Subjects were collected from community population by stratified multi-stage cluster sampling method. The data gathered from case investigation and serological detection.
方法对社区人群采用多阶段分层整群随机抽样方法抽取研究对象，进行个案调查和血清学检测。
The national total population was adjusted for the sampling error and investigation error.
全国数据根据抽样误差和调查误差进行了修正。
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