Methods A survey on prevalence of FD in communities of Shijiu Neighborhood, Rizhao was conducted by using a stratified, randomized cluster-sampling method.
方法采用随机分层整群抽样方法，对日照市石臼街道常住人群进行面访式问卷调查。
Methods A survey on prevalence of FD in communities of Shijiu Neighborhood, Rizhao was conducted by using a stratified, randomized cluster-sampling method.
方法采用随机分层整群抽样方法，对日照市石臼街道常住人群进行面访式问卷调查。
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