multi-stage cluster random sampling
... cluster random sampling method 整群随机抽样方法 multi-stage cluster random sampling 多阶段整群随机抽样 cluster sampling 分组取样 ...
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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。
Methods Subjects were collected from community population by stratified multi-stage cluster sampling method. The data gathered from case investigation and serological detection.
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